Star Tracks Derby 5/3/04

Anna Nicole Smith flashes a victory sign before the start of Saturday's Kentucky Derby.

Being a sweet southern girl, Derby regular Jessica Simpson (with husband Nick Lachey) takes the race seriously, dressing to the hilt for the Churchill Downs fans – and winner Smarty Jones – at the 130th running in Louisville.

Last Call talk-show host Carson Daly takes in the Derby in a dapper blue-and-yellow ensemble.

Ashley (left) and Mary-Kate Olsen celebrate their new movie, New York Minute, at the film's L.A. premiere Saturday. In it, the twins (who turn 18 next month) play sisters who must navigate Manhattan's streets after a series of mishaps. The film hits screens Friday.

At the New York Minute premiere, Mary-Kate Olsen, clad in an '80s-inspired sundress, hams it up for the cameras while sister Ashley plays the demure one behind her.

Cameron Diaz, in Florida shooting In Her Shoes, hides behind her shades under a bright pink parasol. In the film, set for release next year, Diaz plays a party girl who butts heads with her more conservative sister (Toni Collette).

Jennifer Aniston gets a hug from hairstylist Chris McMillan, the brain behind the "Rachel" do, during an Allure magazine party thrown for him Friday at L.A.'s Il Sole restaurant. Aniston's trendsetting locks will make their final appearance on Friends this Thursday.

While Aniston parties in L.A., husband Brad Pitt arrives at New York's Essex House to promote Troy, opening May 14 with Pitt starring as Trojan warrior Achilles. His next project? Starting a family.

A trim Kate Hudson (with mom Goldie Hawn, left) attends the Tribeca Film Festival's Saturday premiere of her latest movie, Raising Helen. The family dramedy, which opens nationwide May 26, also stars John Corbett and Joan Cusack.

Victoria's Secret model Heidi Klum, who is expecting a child with Italian businessman Flavio Briatore this month, shops Saturday in New York's West Village. Although the couple are no longer together, a source told PEOPLE that "they will be raising the child together as friends."