Now that's dedication! Neil Patrick Harris visited The Late Late Show on Monday night where he engaged in an epic show tunes riff-off with host James Corden.
After Harris mocked Corden for winning a Tony for a non-singing role, the music-loving Brit decided to prove he has chops in the vocal competition.
Corden started off singing, "Sit Down You're Rockin' the Boat" from Guys and Dolls, to which Harris responded with the show-stopping "Everything's Coming Up Roses" from Gypsy.
When it came time for ballads, Harris belted out "Being Alive" from Company while Corden tugged at the heartstrings singing "On My Own" from Les Miserables.
Eventually the pair came together to duet on "My Shot" from Hamilton, raps and all.
But it turns out that the stage battle was too much for Harris, who made a hilarious confession when they returned from commercial break.
See photos of Neil Patrick Harris through the years:
'When I went down on my knees there, I had a nice wardrobe malfunction and split my pants from my a** to my knee," the Broadway veteran admitted. "I left it all on the stage for you."
To see inside Harris' NYC townhouse, watch the clip below!