VIDEO: Sean Hayes Opens CBS's LATE LATE SHOW With Rousing Musical Performance

Sean Hayes (Broadway's Promises Promises, NBC's SMASH) served as guest host on last night's THE LATE LATE SHOW on CBS. The talented actor opened the show with a rousing musical performance. Check it out below!

Hayes will guest host tonight's broadcast of THE LATE LATE SHOW, featuring guests actress Allison Janney from the CBS comedy series "Mom", actor Jim Rash and personal trainer Bob Harper.

Hayes most recently appeared on TV in Sean Saves the World, The Millers, Smash and Up All Night, and is well known for his role as 'Jack' on Will & Grace. The actor last appeared on Broadway in 2010's Promises, Promises, opposite Kristin Chenoweth; he was nominated for a Tony Award for his performance.

Hayes' feature film credits include the Bobby and Peter Farrelly comedy "The Three Stooges," "The Bucket List," opposite Jack Nicholson and Morgan Freeman, and the independent drama "Pieces of April," opposite Katie Holmes,Patricia Clarkson and Oliver Platt.