Chris reveals he actually auditioned for the star-studded film -- out Christmas day -- by singing Frank Sinatra's "Fly Me to the Moon."
"I auditioned for [director] Rob Marshall in his living room, and he was very kind, noticed that I was very nervous and he and John -- his partner -- joined me in singing the song and made me feel more comfortable," he remembers. "It's support."
Chris (who also says he's currently single!) also shares the secret to his incredible physique.
"Ellen, that's a lot of fake tan," he says modestly about a particularly steamy shirtless shot. "For the movies you gotta look healthy."
And leave it to Ellen to say what we're all thinking.
"Well you do look healthy. Very healthy," she quips.