'Go On': Matthew Perry and Bradley Whitford have a 'Studio 60' reunion

Matthew Perry will welcome one of his former co-stars to his new series "Go On" later this season.

No, there's not a "Friends" reunion in the offing. Bradley Whitford, who starred with Perry in "Studio 60 on the Sunset Strip," will guest on an episode airing after the new year.

"Working with Bradley Whitford again is so much fun," Perry tweeted Wednesday (Dec. 19). "I mean, I wish we weren't in a hot tub together, but you can't ask for everything."

There's no word yet on the character Whitford will be playing -- or if, in fact, he and Perry's Ryan King do, in fact, end up in a hot tub.

"Go On" returns with new episodes on NBC Jan. 8.