Just over two months ago she stepped out to support American troops attending the Marine Corps ball with a lucky sergeant.And it appears that Mila Kunis is always happy to support a good cause attending the St Jude Children’s research Hospital 50th Anniversary Gala.

The 28-year-old opted for a racy dress for the evening stepping out in a purple gown with a low cut neckline held together with a tie.The feminine dress also boasted a frilled skirt and she teamed the bold look with a pair of peep toe heels.Mila attended the event which helps children fighting cancer and other fatal diseases alongside a number of familiar faces.

Sex And The City star Kirsten Davies also opted for a plunging neckline wearing a simple black dress to the charity event.Pretty in purple: The 28-year-old actress was dressed in a the bright frock which boasted a ruffled skirt and lace bodice top for the event held at the Beverly Hilton hotel.Williams Shatner also attended the event with his wife Elizabeth while Anne Heche and James Tupper also walked the red carpet together.

American actress Alison Sweeney ,Canadian actress Natasha Henstridge and Presenter Daisy Fuentes also attended the party.Now Mila Kunis is following in the footsteps of her Black Swan co-star, as she has just been named the latest celebrity name to join the label's ranks of A-list models.

The softly-lit campaign for the label's spring 2012 collection sees the Ukraine-born actress, 28, dressed in black, posing with the new Miss Dior handbag.Miss Kunis told WWD: 'I'm honestly just learning about fashion... In my daily life, I don’t wear the most feminine pieces. But I love to feel feminine when I’m on the red carpet.'