Spanx very much! Princess Beatrice shows off support tights at Queen Mother memorial
She may have recently lost two stone, but Princess Beatrice was determined not to have a VPL (visible panty line) at a memorial for the Queen Mother and Princess Margaret - by donning a pair of supportive Spanx.
The split at the back of her pretty floral Paul Smith dress inadvertently gave her style secret away.
She teamed the flower power frock with a Sarah Davis fascinator and LK Bennett heels for the service at St George's Chapel in Windsor.
Of course, the princess is in good company among fans of the figure-shaping shorts and tights, with everyone from Beyoncé to Sarah Jessica Parker having previously flashed theirs.
And the brand is so successful that, at 41, its founder, Sara Blakely, was recently the youngest self-made woman to make it on to the Forbes' Billionaires list.
Princess Beatrice was joined by a host of other royal family members for the service, apart from the Duke and Duchess of Cambridge, who are enjoying a skiing holiday in Switzerland.