Entourage has landed a big guest star for season eight. Or, to be more specific, a Big Bang of a guest star!

Johnny Galecki (below, left), who helps anchor The Big Bang Theory as Leonard, will appear on an episode of this HBO comedy as a version of himself.

As broken by E! News, look for Galecki to be taken on as a client by Eric and Scott. From there, look for things to get awkward when Johnny makes a play for Eric's fiancee, Sloan.

HBO has already confirmed this will be the final season for Entourage. A big screen version of the show is likely to follow.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.