Beyonce, Jay Z Happy Birthday to Someone

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Beyonce and Jay Z showed up Saturday to a big birthday bash in Bev Hills, but the birthday kid remains a mystery.

Bey and Jay, along with Blue Ivy, showed up at Giggles and Hugs for the party, along with Kelly Rowland and Ellen Pompeo.

Blue's Bday is Jan 7th, so count her out.  Whoever was the birthday boy or girl, a good time was clearly had by all.