Jennifer Lopez's nip slip wardrobe malfunction - oops
Concertgoers say J.Lo was a trooper, getting some assistance from a backup dancer to put the girls back in place and then continued right on with the show.
RELATED: Notable celebrity nip slips
This is definitely not Jenny from the block's first encounter with a nip slip. She accidentally peeked a little nipple at at the Oscars last February and in the summer of 2011, almost a whole boob fell out on a German talk show.