Actor Matt Damon says he'll really be kissing Michael Douglas' wife Catherine Zeta-Jones when the pair lock lips in the upcoming Liberace biopic.

The 66-year-old Douglas is preparing to play flamboyant pianist Liberace opposite Damon, who'll play the part of Scott Thorson, Liberace's alleged lover.

Acclaimed director Steven Soderbergh will direct the film based on a script by Richard LaGravenese, which is based on Thorson's book Behind the Candelabra (My Life With Liberace.)

Filming is expected to begin next summer, and Damon told PEOPLE magazine that he sees the kiss as an opportunity to smooch Douglas' wife.

“I kind of think of it in algebra terms,” he said of the kiss. “It's like the transitive property – by kissing Michael Douglas, I am making out with Catherine.”

The 40-year-old Damon added that he and Douglas are excited about the film: “They're two really great roles, and we're really looking forward to it.”

Already filming is the Clint Eastwood-directed J. Edgar, which stars Leonardo DiCaprio as FBI director J. Edgar Hoover and Armie Hammer as his alleged lover.