ET was on the red carpet with Andrew Keegan as the hunky '10 Things I Hate About You' actor made his stage debut in He Asked For It -- an award-winning play about the complexities of gay relationships in modern times -- in Hollywood on Friday night.

"We're excited to have the audience there. It added a new element to it," Andrew told ET at the play's red-carpet premiere. "And for me, it was the first time. You know they're going to laugh. [The audience members] have this energy there that affects everything you're doing."

He Asked For It explores the lives of several HIV-positive men in Los Angeles. Andrew's multi-talented co-star Brian Unger ("The Daily Show," NPR's "All Things Considered") also makes his stage debut in the play.

"This is the first play I've done -- like a major play -- since I did The King and I. I was 12 years old then," he cracks. "We're a good ensemble. We really like each other, so we're having a lot of fun."

The ensemble cast also features Joe Egender ("CSI: NY," "The West Wing"), Jeremy Glazer, Sarah Foret, Kyle Jordan, Carter MacIntyre and Alex Boling. Understudies include Ber Fox, Nathan Frizzell, Brian Guest, Sean Hemeon and Lisa Schwartz. The play was written by Erik Patterson and directed by Neil H. Weiss.

"He Asked For It" will run through July 19 at the Macha Theatre in West Hollywood. Click here for more info!