ET was there as Reese Witherspoon premiered her festive holiday flick 'Four Christmases' at Grauman's Chinese Theatre in L.A. Thursday night. Watch her co-stars share what it was like to work with the actress, and hear Reese talk about some minor problems she had while filming scenes with Vince Vaughn!

"I was always on a ramp or a box or something," Reese tells us about shooting scenes with Vince. "It was difficult during the kissing scenes trying to reach up that high."

Other stars from the film on hand included Robert Duvall, Mary Steenburgen, Sissy Spacek and Kristin Chenoweth.

Mary Steenburgen fills us in on her experience working with the Oscar-winning Reese.

"Reese is amazing and talented," Mary tells ET. "She could wear the producer's hat one moment and be an amazing actor doing a scene with you the next. I'm very impressed with her, -- I love her, she's great." In 'Four Christmases,' in theaters November 26, Reese and Vince Vaughn play a happily-unmarried couple whose annual holiday escape plans are foiled, and they find themselves forced out of obligation to endure a Christmas get-together with each of their respective divorced parents and wild siblings.