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Who? Jessica Alba
What? Jessica Alba looked beyond-beautiful in her black Ferragamo dress, perfectly donned for the launch of the flagship Salvatore Ferragamo store on Old Bond Street. Jess completed her look with a black crocodile skin clutch bag, a pair of black heels and matching nail varnish for sexy-chic style.

Where? Old Bond Street, London.
Verdict? This Winter is all about adding glamour to your wardrobe be it with embellishment, luxe-leather, statement jewellery or simply trending a dip dye do like Alba. We're mixing in it all.
Take a look at more celebrity dip dyes in our gallery below. Tempted or are you already on the band wagon?
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The look book: Celebrities rocking dip dye hair
Whitney Port
The City star showed off the barely-there dip-dye graduating her light brown roots into platinum waves. Pretty.
The look book: Celebrities rocking dip dye hair
Alexa Chung
The Queen of cool worked the dip-dye 'do at the 2010 British Fashion Awards, and fused chocolate-brown roots with bright blonde tips. We think it kinda works...
The look book: Celebrities rocking dip dye hair
Caroline Flack
Caroline Flack shows off her two-tone blonde curls at Cosmo's Ultimate women of the year Awards.
The look book: Celebrities rocking dip dye hair
Cat Deeley
The Brit beauty really tapped into the LA look at the 2011 People's Choice Awards, and worked two different colours through her beachy waves, with a look-at-me blonde giving way to a glowing brown base.
The look book: Celebrities rocking dip dye hair
Dannii Minogue
Dannii worked two-tone tresses at the 2010 X Factor final press conference - and we thought she pulled off the daring look with aplomb. The stylish bob cut and glamorous matching lippie and dress combo helped to create a classy finish.
The look book: Celebrities rocking dip dye hair
Drew Barrymore
Never one to shy away from a style statement, the Charlie's Angels star pretty much kicked off the dip-dye trend.
The look book: Celebrities rocking dip dye hair
Jessie J
Jessie J debuted some long purple-tipped hair extensions at Capital FM's Jungle Bell Ball.
The look book: Celebrities rocking dip dye hair
KT Tunstall
The singer worked the rock chick look at the Q Awards in London, toughening up a pretty plait with platinum tips.
The look book: Celebrities rocking dip dye hair
Nicola Roberts
The Girls Aloud star showed off her new, longer hairstyle (and some very white teeth) at an event in London. We think this volumised, dip dye do is one of Nicola's best looks to date.
The look book: Celebrities rocking dip dye hair
Rihanna
No stranger to wild and crazy hairdos, the singer was (of course) one of the first stars to sport the two-tone look at a 2010 pre-Grammy party in LA. She rocked a honey-blonde quiff with brown shaved sides for an unconventional, bold barnet.
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