Jennifer Aniston  is one of the many stars presenting at Sunday's Academy Awards ! She's never been nominated for an Oscar herself, but has played a part in the big event in years past. Jennifer's taken the stage solo, presented with Jack Black , and celebrated the show at Vanity Fair's bash with Brad Pitt . Click through to see all of Jennifer's Oscars moments and make sure to fill out our Oscars ballot  for a chance to win $1,000 and an iPad.
Jennifer Aniston  stopped to chat with pal George Clooney  on the red carpet at the 2006 Academy Awards. It was her first time attending the big award show.
Jennifer Aniston  and Brad Pitt  celebrated the 2000 Academy Awards at the Vanity Fair Oscars party, though they didn't attend the show.
Jennifer Aniston  chose a Valentino gown for her 2009 turn at the Oscars. She brought then boyfriend John Mayer  as her date, and the duo cuddled inside the Vanity Fair afterparty.
In 2006, Jennifer Aniston  wore a Rochas gown to celebrate post-Oscars at Vanity Fair's annual bash.
Jennifer Aniston  joined Jack Black  on stage in 2009 to present the award for best animated feature film, while nominees Brad Pitt  and Angelina Jolie  watched from the audience's front row.
In 2006, Jennifer Aniston  presented the award for best costume design. She wasn't up for any honors, but her Friends With Money costars, Frances McDormand and Catherine Keener, were both nominated in the best supporting actress category for other films.
Jennifer Aniston  posed in the press room with Colleen Atwood after presenting her with the statue for best costume design for Memoirs of a Geisha in 2006.