Beyoncé's blouse slipped open as she jumped up and down, revealed

Beyoncé's blouse slipped open as she jumped up and down, revealed

Beyoncé woke up with a top that didn't want to stay closed at Saturday's Global Citizen Festival, an anti-poverty concert held in Central Park.

Jay Z brought his better half onstage to perform Justin Timberlake's part in "Holy Grail" and to collaborate on the crowd-pleaser "Young Forever." During the former, Beyoncé's blouse slipped open as she jumped up and down, revealing a tan bra. The singer spent the rest of the performance pulling the top closed and smiling like nothing fazed her