Sacha Baron Cohen's Daughter Turns 1 -- With Jennifer Aniston!

Sasha Baron Cohen and Isla Fisher 's daughter, Olive, turned one-year-old in Beverly Hills Sunday with a star-studded soiree! Jennifer Aniston , Courteney Cox , Ellen DeGeneres , Portia De Rossi and Dustin Hoffman were among the revelers at the backyard bash. (But Aniston's newly reunited beau, John Mayer , was not spotted at the party. See more couples who keep getting back together. ) The theme? Country Western! Guests ate BBQ at red-checkered tables adorned with vases of sunflowers. Jen Meyer and husband Tobey Maguire brought daughter Ruby, 23 months, who was decked out in a cowboy hat. The family also toted another wrapped-up cowboy hat for the birthday girl! Fisher, 32, and Cohen, 37, announced their engagement in 2004 - but have yet to set a wedding date. Olive, their first child, was born on Oct. 23, 2007. Remember this crazy outfit Fisher wore? (link)