Former Grey's Anatomy star T.R. Knight is the latest openly gay actor heading to Broadway, the AP reported.

Knight will play John in playwright David Mamet's A life in the Theatre.

Patrick Stewart will star opposite Knight as Robert, a veteran actor who counsels John, a young actor who shows great promise. The two men begin a relationship that continues as Robert's career begins to decline and John's progresses.

Knight is the latest openly gay actor to turn to Broadway. Recently out singer Ricky Martin is set to play Che Guevara in the Broadway revival of Evita. The production is set to open in 2012.

And Will and Grace alum Sean Hayes has been nominated for a best actor Tony Award for his Broadway debut in Promise, Promises.

Also competing in the same category is Kelsey Grammer for his interpretation of gay nightclub owner Georges in the Broadway revival of La Cage Aux Folles.

Sean Hayes will host Sunday's 64th Annual Tony Awards, which will be carried live on CBS.

A Life in the Theatre previews starring Knight and Stewart are scheduled to begin in September.