And isn't it refreshing to see them both looking so, well, normal?
Sister act: Kate and Pippa enjoyed a scenic stroll along the beach in Wales. Photo:bauergriffinonline.com
Blending in with the other seaside tourists, who seemed barely to bat an eyelid, Kate and Pippa enjoyed their afternoon exploring the scenic North Wales island, keeping wrapped up from the sea breeze in a scoop neck jumper and button-front cardigan, respectively.
We'd love to know what those two gossip about...
Click on our galleries below to see more stylish moments from the Middleton sisters:
- Pippa Middleton's best style moments<p> The maid of honour stunned the nation as she walked into Westminster Abbey in this jaw-droppingly beautiful bridesmaid dress designed by Sarah Burton for Alexander McQueen.</p>
- Pippa Middleton's best style moments<p> Miss Middleton continued to wow in her second show-stopping dress of the royal wedding; a gorgeous Temperley gown.</p>
- Pippa Middleton's best style moments<p> Pippa dressed the part for the wedding of the Duke and Duchess of Northumberland's daughter, Lady Katie Percy, in February earlier this year. Is that a spot of fake tan we can see on those bare legs?</p>
- Pippa Middleton's best style moments<p> She looked pretty in pink at the Royal Parks Charity Gala in 2008.</p>
- Pippa Middleton's best style moments<p> Pippa showed off her perfect polo outfit at a charity match in 2009; undone hair, a flirty, figure-hugging dress and matching peep-toe pumps.</p>
- Pippa Middleton's best style moments<p> Pippa turned heads at the Boodles Boxing Ball in striking red dress.</p>
- Pippa Middleton's best style moments<p> Pippa Middleton attends the autumn dinner and All Saints party in aid for Too Many Women.</p>
- Pippa Middleton's best style moments<p> Pippa spotted shopping in London.</p>
- Pippa Middleton's best style moments<p> Pippa Middleton at Temperley London Show during London Fashion Week S/S 2012</p>
- Pippa Middleton's best style moments<p> The 28-year-old kept warm in a classic white coat, skinny black jeans and leather gloves for the launch of Somerset House ice rink, hosted by Tiffany & Co.</p>
- Day eight: Calgary<p> And the pair went all out in the style stakes, with William in a checked shirt, and Kate in flared jeans and cowboy boots.</p>
- Day eight: Calgary<p> In a break from royal protocol, the pair topped off their rodeo show ensembles with matching his 'n' hers white cowboy hats.</p>
- Day eight: Calgary<p> Day eight and the couple arrived in Calgary, where they were met by members of the Canadian Forces Flight Crew at the airport.</p>
- Day eight: Calgary<p> With William at his dapper best in suit and tie, Kate suprised onlookers by eschewing her normal colour palette preference of navy, nude and cream, in favour of a sweet yellow Jenny Packham dress.</p>
- Day eight: Calgary<p> Kate was presented with a bouquet of flowers from six-year-old cancer sufferer Diamond Marshall, who gave the Duchess a huge welcome hug after winning a chance to meet the royal couple through Canadian charity <em>Children's Wish</em></p>
- Day seven: Slave Lake<p> The Duke and Duchess arrived in Slave Lake for day seven of their tour, with Kate donning her new favourite J Brand jeans, a navy Smythe blazer and Nine West wedge heels.</p>
- Day seven: Slave Lake<p> The royal couple took a tour around the devastated area of Slave Lake, which was destroyed by wildfire back in May. The pair met with rescue workers and families who lost everything in the tragic event.</p>
- Day six: Blatchford Lake<p> William and Kate were made honorary Canadian Rangers during their trip to Blatchford Lake, and were given matching red hoodies to wear.</p>
- Day six: Lake Blatchford<p> Day six and William and Kate enjoyed a serene canoe ride with elder Francois Paulette, from the Fort Smith area at Lake Blatchford. </p>
- Day six: Lake Blatchford<p> The Duke and Duchess arrived at Lake Blatchford in the Northwest Territories, by sea plane.</p>
- Day six: Lake Blatchford<p> Kate changed out of her frock and heels and into a more casual ensemble of khaki shirt and skinny jeans - teamed with her trusty Sebago boat shoes.</p>
- Day six: Yellowknife<p> The pair met fans at the Somba K'e Civic Plaza in Yellowknife during the morning of day six, with Kate choosing to wear her first dress by a non-British designer since landing in Canada. The Duchess donned this soft-beige frock by Danish designer By Malene Birger.</p>
- Day six: Yellowknife<p> The couple were invited to join in a game of street hockey by the locals, with William attempting (and unfortunately, failing) to score a goal.</p>
- Day six: Yellowknife<p> While William got stuck in, Kate's LK Bennett heels prevented her from getting too involved, so she stuck to simply dropping the ball to signal the start of the game.</p>
- Day six: Yellowknife<p> The pair were presented with their very own 'Cambridge'-emblazoned hockey jerseys.</p>
- Day five: Yellowknife<p> The Duke and Duchess were met by rain as they arrived in the Northwest Territories, with Kate showing off her lean legs in a navy button-up trench and her new favourite Prada heels.</p>
- Day five: Dalvay-by-the-sea<p> Kate showed off her sporting side for a trip to Dalvay Lake, in skinny jeans, nude Sebago boat shoes and a Nike windbreaker jacket.</p>
- Day five: Dalvay Lake<p> Lifejackets on! The royal pair prepared to battle it out in a dragonboat race across the lake.</p>
- Day five: Dalvay Lake<p> Despite William's team winning by just half a boat length, the pair had a quick cuddle afterwards to show there were no hard feelings.</p>
- Day five: Prince Edward Island<p> Day five of William and Kate's royal tour started in relatively low-key fashion, with a mini-procession through Charlottetown in a horse-drawn carriage - or landau - flanked by traditional Canadian mounties.</p>
- Day five: Prince Edward Island<p> For her day five styling, Kate looked to the fashion house who created <em>that </em>royal wedding dress, stepping out in a cream cable-knit dress by Alexander McQueen.</p>
- Day five: Prince Edward Island<p> Prince Edward Island is the setting of novel <em>Anne of Green Gables</em> - a personal favourite of Kate's. In celebration of their arrival, the royal pair were met by actors in period costumes.</p>
- Day five: Prince Edward Island<p> The couple seemed in high spirits as they posed for a photocall outside Providence House in Charlottetown, before heading inside for a welcome ceremony.</p>
- Day four: Prince Edward Island<p> Day four of the royal tour saw William and Kate touch down at Charlottetown airport on Prince Edward Island.</p>
- Day four: Prince Edward Island<p> With William dapper in a black suit and red tie, Kate kept it chic in an off-white shift dress, nude heels and pale pink boucle jacket.</p>
- Day four: Prince Edward Island<p> Later on during the day and the Duchess whipped off her jacket to reveal her slender frame in the simple Joseph knee-length dress.</p>
- Day four: Quebec City<p> The royal couple began day four of their visit in Quebec City - with Kate opting to wear her second Erdem dress of the week, this time in a striking regal blue.</p>
- Day four: Quebec City<p> The couple were invited aboard the HMCS Montreal during their stay, which was adorned with huge Canadian flags for the occasion.</p>
- Day four: Quebec City<p> On board the boat which was moored in Quebec City, the couple took part in a religious ceremony where they sang hymns and listened to sermons.</p>
- Day four: Quebec City<p> William and Kate paid a visit to the Maison Dauphine centre - a drop-in centre for homeless youths in Quebec.</p>
- Day three: Montreal<p> To round off day three of the couple's tour, and the pair arrived in Montreal - where they were promptly put to work in the kitchens of the Insitut de Tourisme D'hotellerie du Quebec.</p>
- Day three: Montreal<p> William and Kate donned their chef's whites to take part in a cooking workshop and prepare a three-course meal.</p>
- Day three: Ottowa<p> The last port of call in Ottowa was a quick visit to the Canadian War Museum, with Kate looking conservative in a grey Catherine Walker dress, lizard-print Tabitha Simmons pumps and matching Hobbs clutch.</p>
- Day three: Ottowa<p> William and Kate were given the honour of unveiling a new painting inside the War Museum.</p>
- Day three: Ottowa<p> Before departing Ottowa on the third morning of their trip, the Duke and Duchess attended a tree planting ceremony outside Rideau Hall.</p>
- Day three: Ottowa<p> The tree planted by William and Kate was positioned next to the tree that Charles and Diana helped to plant during their royal visit back in 1983.</p>
- Day two: Ottowa<p> William and Kate rounded off their second day by enjoying the Canada Day evening show set on Parliament Hill. The pair were joined by representatives of the National Capitol Commission.</p>
- Day two: Ottowa<p> Kate opted to wear another dress by favourite designer Issa, in the form of this bright purple draped design - which she teamed with classic Prada pumps and a sparkling maple leaf brooch.</p>
- Day two: Ottowa<p> Day two and the Duke and Duchess were invited to a ceremony on Parliament Hill for Canada Day, where they watched new Canadian citizens receive their citizenship certificates.</p>
- Day two: Ottowa<p> And, as is tradition for British royals visiting Canada, Kate got appropriately patriotic in red and white - including a standout scarlet fascinator with maple leaf design.</p>
- Day two: Ottowa<p> And if you think you recognise Kate's white frock, that's probably because it's the very same <a href="http://www.mydaily.co.uk/2011/02/10/kate-middletons-engagement-dress-reiss-nannette-available-to-buy-again/" target="_blank">Reiss dress</a> worn in the couple's official engagement photos.</p>
- Day one: Ottowa<p> For their first evening in Canada, William and Kate were invited to attend a youth reception in the evening.</p>
- Day one: Ottowa<p> Kate swapped her Erdem frock for this sweet printed Issa dress, which she teamed with a pair of black wedges.</p>
- Day one: Ottowa<p> The couple spent the evening chatting to young Canadian citizens at the reception - initially supposed to be a barbeque, but which had to be cancelled at the last minute due to wet weather.</p>
- Day one: Ottowa<p> Quick, change! The pair touched down at Macdonald-Cartier International airport in Ottowa having had a freshen up during their seven-hour flight.</p>
- Day one: Ottowa<p> Having set off in that navy Roland Mouret dress, Kate arrived wearing an elegant lace number by Canadian-born, British-based designer Erdem - accessorising with her favourite LK Bennett heels and a nude clutch.</p>
- Day one: Ottowa<p> Upon arrival, the pair were driven to Rideau Hall in the city centre for an official welcome meeting - where hundreds of Canadian fans were waiting to greet them.</p>
- Day one: Ottowa<p> Kate was presented with a bouquet of flowers by two local girls, as she stood next to Canadian Prime Minister Stephen Harper and his wife Laureen.</p>
- Day one: Ottowa<p> The royal couple laid a wreath each at the city's war memorial.</p>
- Day one: London<p> And so it begins! William and Kate were snapped departing London Heathrow this morning to embark on their first official overseas tour as a married couple.</p>
- Day one: London<p> The world's media will be tracking William and Kate for the next couple of days. The eight-day visit - designed to 'reaffirm the important role' of the British monarchy - will be covered by an estimated 1,500 journalists. So, no pressure, then...</p>
- Day one: London<p> For such a high profile visit, the Duchess decided to bring out the fashion big guns - and was dressed to jet set in a chic Roland Mouret dress and matching navy blazer.</p>
- Day one: London<p> And their first stop? Ottowa. The pair will celebrate Canada Day in the city on Friday, before heading on to Quebec. And apparently, there's everything from canoeing to campfire singing in store for our royals...</p>
- Day eight: Calgary<p> Yee-ha! William and Kate got into the cowboy spirit when they attended the world-famous Calgary Stampede, arriving on a traditional Western wagon.</p>
Gwen Stefani (Aka The Coolest Mum Around)...