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Beyonce, Shakira, Justin Bieber

STAN HONDA/AFP/Getty Images; GTRES/FAMEFLYNET PICTURES; instagram

Blunders, babies and butts, oh my!

While Shakira was busy giving birth to her baby boy Milan Tuesday, Beyoncé was dealing with a lip-synching controversy and Justin Bieber was showing off his, um, assets on Twitter.

And those weren't the only celebrities making headlines this week.

Take a look at the stars that topped our most recent photo galleries!