Washington, Mar 22 : Jennifer Aniston will be making a special appearance on the season finale of Oprah Winfrey's ABC reality hit Big Give.

On the episode, which airs on April 20, the contestants will be challenged to create 'big gives' with no money and very little time.

The 'Break-Up' star will announce "big news" on the show, according to a press release, but her role remains shrouded in secrecy.

"What can I possibly say that won't get my ass kicked?" Us magazine quoted judge Jamie Oliver, as saying.

"I not allowed to say anything - but believe me, I'd love to!" he added.

Producer Ellen Rakieten said that Aniston immediately agreed to appear on the show.

"She was like, 'Whatever you guys need,'" Rakieten said.

"Jennifer is the nicest, kindest, sweetest person. She's the best friend you'd always want," Rakieten added.