'Two and a Half Men' -- The FAMOUS Funeral Guests

It's gonna be a Full House at Charlie Harper's funeral service on "Two and a Half Men" ... because one of the stars in attendance will be none other than Uncle Jesse himself ... John Stamos!

Sources connected to the production tell TMZ ... Stamos -- who was once rumored to be Charlie Sheen's replacement on the show -- will say a couple of words at the service ... raunchy words.

We're told Stamos' character will reveal he and Harper were CLOSE friends ... the kind of friends who once three-way'd a chick together.

Sources tell us Jenny McCarthy will also be at the funeral -- she famously played one of Harper's ex-girlfriends who broke up with Charlie after she got tired of having sex with him.

Melanie Lynskey will also return as "Rose" -- who was last seen going to Paris with Harper in the very last episode featuring Charlie Sheen.