The 'Blurred Lines' hitmaker showed more skin than he intended when a button on his shirt popped off, revealing Thicke's midriff.
A photographer in the pit pointed out the mishap to Thicke, who then attempted to tuck in his shirt, reported E! online.
That was not the only wardrobe malfunction the singer endured. Later, during his performance, the 36-year-old singer's pants came partly unzipped.