Rob Lowe, Scott Bakula and Cheyenne Jackson have joined the cast of the upcoming biopic based on the life of Liberace.

The HBO film which stars Michael Douglas (Wall Street) as Liberace and Matt Damon (Contagion) as Scott Thorson, the singer's alleged lover, will begin filming at the end of July in Los Angeles, Las Vegas and Palm Springs.

The movie on the life of the flamboyant pianist is based on a script by Richard LaGravenese (Water for Elephants), which is based on Thorson's book Behind the Candelabra: My Life With Liberace. Acclaimed director Steven Soderbergh will direct the film and Jerry Weintraub will executive produce. Soderbergh has said he's considering retiring after the project's completion.

Rob Lowe (Parks and Recreation) is reportedly in talks to play Liberace's plastic surgeon, while Scott Bakula (Star Trek: Voyager) will play the choreographer who introduced Liberace to Thorson, Bob Black.

Cheyenne Jackson (30 Rock) told The Hollywood Reporter that he's landed a part in the film, but could not go into details.

“I'm not allowed to say who I'm [playing] but it's pretty exciting,” he said.

(Related: Michael Jackson had gay affair, Scott Thorson, Liberace's former boyfriend, claims.)

UPDATE: is reporting that Jackson will play Jerry O'Rourke, a former lover of Liberace's.