HBO is adding even more celebrity guest spots to its 'Entourage.'

The Emmy-winning series will roll out the red carpet for many of Hollywood's finest this season, including a teen heartthrob and an Oscar-winning actor. The show even has plans for a Super Bowl MVP and an NBA superstar.

Here are some of the highlights:HBO is adding even more celebrity guest spots to its 'Entourage.'

The Emmy-winning series will roll out the red carpet for many of Hollywood's finest this season, including a teen heartthrob and an Oscar-winning actor. The show even has plans for a Super Bowl MVP and an NBA superstar.

Here are some of the highlights:

Matt Damon
Role: The Oscar winner will appear as himself on the show's Oct. 4 finale, in which he ropes Vince (Adrian Grenier) into making a hefty donation to his charity. Damon will also share a scene with NBA superstar LeBron James.

Zac Efron
Role: Details on Efron's cameo remain unknown, but the 'High School Musical' star is expected to play himself on an upcoming episode, which reportedly features a scene at the Beverly Hills Niketown.

Tom Brady
Role: The Super Bowl MVP will switch sports for an episode, playing himself in a celebrity golf tournament.


David Schwimmer
Role: On Aug. 2, the 'Friends' star will stop by Andrew's (Gary Cole) office for some friendly TV career advice.


Jami Gertz
Role: In a recurring performance, Gertz ('Still Standing') will play Andrew's wife, Marlo Klein -- or Mrs. Andrew, as fans are sure to call her.


Scott Caan
Role: He'll play Scotty Lavin, a trash-talking, insecure agent who views E (Kevin Connolly) as a threat. Just wait until he gets a load of Sloan.


50 Cent
Role: In an episode slated to air in August, 50 Cent will follow in the footsteps of rappers Kanye West, T.I. and the rumored Lil Wayne with a cameo apperance.


Autumn Reeser
Role: Best known for playing the bubbly Taylor Townsend on 'The OC,' Reeser will join the cast as Lizzy Grant, Miller/Gold's newest junior agent. So does this mean we'll soon be hearing screams for "LIZZY!" instead of "LLOYD!"?

William Fichtner
Role: Phil Yagoda, a TV producer who wants Drama (Kevin Dillon) to star in the movie version of his hit '90s TV series. We take it Vince passed on the role.


Kate Mara
Role: Mara, who played Heath Ledger's daughter in the Oscar-winning 'Brokeback Mountain,' will play E's new assistant and -- based on his track record with women -- probable love interest.