Mary-Kate Olsen and Nicole Richie Party Hard

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We’re not sure whose house this is or what the hell is going on, but here’s Mary-Kate Olsen, Joel Madden, Nicole Richie, and other random fugliness at some lame house/birthday/flannel/whatever party. Whatever it is, it looks pretty hot, because nothing says hardcore like a pinata. Maybe next time they can get a bouncy house or hire a clown to make balloon animals. Ooh, ooh, or balloon hats! I love those!

Photo credit: ONTD