Bruno Mars Launches His Bluesy “Grenade” On ‘David Letterman’

Bruno Mars hit up the Late Show With David Letterman last night and left a piece of his heart on the stage after turning out an emotional, bluesy rendition of his new single “Grenade.” It was a Grade A performance from the hitmaking singer-songwriter, that found him backed by an all-female string section. Watch Bruno’s heart-tugging stint on Letterman below!