Jennifer Aniston and John Mayer finally made their red carpet debut at the Oscars on Sunday night. "This is my first time walking the red carpet with someone!" Mayer told the Oprah Winfrey Show. Aniston, who wore a dramatic cream Valentino column dress, presented the award for Best Animated Feature with comedian Jack Black in front of Brad Pitt and Angelina Jolie. At one point the camera cut to Jolie smiling at one of Aniston's jokes. Jen and John later attended the Vanity Fair party where the on-and-off again couple partied into the wee hours. (Photo: WENN)