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    Fifth Harmony Teepees Simon Cowell's House for His "87th Birthday"

    Simon Cowell, Fifth Harmony, Home The Media Circuit/AKM-GSI

    Fifth Harmony has no problem with toilet humor apparently.

    The all-American girl group, who shot to fame on the second season of The X Factor, couldn't resist sending their mentor Simon Cowell some pretty asinine birthday wishes on Monday when they rolled the music mogul's Beverly Hills mansion with toilet paper!

    Cowell, who turned 54 today, woke up to find streams of teepee hanging from trees on his front lawn.

    And just in case Simon was unaware who the pranksters were, the quintet let the cat out of the bag by having a banner hunt across his driveway reading, "Happy 87th Birthday Simon!! Love, Fifth Harmony."

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    Dinah Jane Hansen, Lauren Jauregui, Ally Brooke, Normani Kordei, Camila Cabello, Fifth Harmony, VMA's Courtesy of Larry Busacca/Getty Images for MTV

    We're pretty sure the soon-to-be dad enjoyed hearing that. At least he knows where to send the cleanup bill.

    Cowell, of course, was the one responsible for forming Fifth Harmony last year at the end of The X Factor's boot camp.  Despite finishing in third place, he signed the ladies to a record deal and the band's career has since taken off. Not only are they headlining their first concert tour this year, but they also landed a slot as the opening act for X Factor judge Demi Lovato on her 2013 Neon Lights Tour.

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