Michelle Williams sat down on the Late Show With David Letterman to promote her upcoming release, Oz the Great and Powerful in NYC last night. She's focused on her Disney film, but David Letterman brought up her many previous Oscar nominations, congratulating Michelle on the honors. She won't be attending the big show on Sunday, but talked about hitting the red carpet last year with "best friend" Busy Philipps. Michelle joked that their award-season rounds created rumors that the two might be more than just friends. Watch for the full story now!