There is sometimes nothing better than a good-old music video cameo. "Oh! That's the guy from ...!" you yell with excitement at the sight of a recognizable face. Recording artists know the power of an appearance from a fellow celeb, and routinely solicit Hollywood A-listers, quirky comedians, and their musician colleagues to star, or sometimes only briefly grace us with their fleeting presence, in the ever-captivating cameo. In honor of the stars who lend their talents, or sometimes just their mugs, to our favorite songs, we're counting down the most memorable music video celeb cameos.