Ken Leung by Johnny Nunez/WireImage.com
Uncle Junior's poker buddy just hit the jackpot.

Ken Leung - whose memorable turn as Uncle Junior's mentally unstable protégé on The Sopranos last season turned many a head in Hollywood (mine included) - is joining the cast of Lost next season, sources confirm to me exclusively.

The rumor is that Leung will be playing the recurring role of Russell*, a brilliant mathematician who is capable of great insights and has a tremendous knowledge across various scientific fields. He's expected to first turn up in February's season premiere.

Non- Sopranos fans may know Leung from his role as Kid Omega in Brett Ratner's franchise killer, X-Men: The Last Stand.

* May not be the character's real name.