Justin Timberlake Sings National Anthem With Stephen Colbert

"You know that church is the best place to sing because you can go up there and completely botch anything and then at the end everyone says, 'amen,'" Timberlake quipped.

The worst number for wannabe singers to learn?: the National Anthem. Colbert and Timberlake harmonized on the notoriously difficult-to-sing song before Stephen grilled Justin about his upcoming Super Bowl show. The host alluded to Timberlake's 2004 performance, which ended in Janet Jackson's unforgettable "wardrobe malfunction." Justin didn't reveal much but remained diplomatic: