Washington DC, June 4 -- Actor Jennifer Aniston made a rare reference to her ex-husband Brad Pitt while reflecting on some of the most memorable guest appearances on the hit sitcom'Friends', according to E! News.

During a joint interview with her former co-star Lisa Kudrow for Variety's Actors on Actors, Aniston reflected on the show's popular Thanksgiving episodes and Pitt's guest appearance in one of them.

"Those were great, the Thanksgiving episodes," Kudrow said. "When Brad was on, that was hilarious," according to E! News.

"I know," Aniston replied. "How funny."

The conversation turned to the many high-profile actors who appeared on the sitcom over its 10-season run. Aniston recalled the long list of Hollywood stars who made gues...