Renee Zellweger: Reese Witherspoon's Wedding Guest

Renee Zellweger arrives at the Ojai Valley Inn on Friday (March 25) in Ojai, Calif.

The 41-year-old newly single actress was in town to celebrate pal Reese Witherspoon‘s wedding!

Reese and Renee both voiced characters in 2009′s animated film Monsters vs. Aliens!

Other celebs attending the intimate ceremony at Reese‘s ranch included Isla Fisher, Alyssa Milano, Salma Hayek, Tobey Maguire, and Robert Downey, Jr.