Katherine Heigl glammed up the Oscars red carpet in a sexy red gown, but she's not the only "Greys Anatomy" star all dressed up!

We showed Heigl a photo of co-star Patrick Dempsey in a dress for his upcoming movie "Made of Honor" and asked her who was better at cross-dressing for a movie; Dempsey or John Travolta in "Hairspray?" See who she chose in the video above!

Plus, where was hubby Josh Kelley?