The stunning model is attending the prestigious Met Ball in New York next month and when she couldn't decide what to wear, she turned to her designer friend who was more than willing to help out.
She said: "Luckily for me, the friend is Stella McCartney and the dresses she made for me are perfect in the way that can only happen when someone not only knows your size and your style, but intuitively your issues and inhibitions too."
Stella created two gowns for Laura to wear - ivory with lace and pleated bronze with chiffon detailing - and the 37-year-old beauty has decided to go with the "braver" choice.
She told vogue.com: "I plumped for the darker one. Braver with pale skin."
Laura will accessorise her dress with jewellery by her pal Solange Azagury-Partridge, who she will go to the ball with as well as Thandie Newton.
This year, the Met Ball - which is sponsored by Gap and will see designers collaborating with the high street store to dress star guests - will have a theme of American Woman: Fashioning a National Identity.