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On Monday night, Beyoncé Knowles celebrated her 35th birthday in style (duh) with a Soul Train-themed party attended by the likes of Alicia Keys, Janelle Monae, Chance The Rapper, Usher and his wife Grace Miguel, former Destiny's Child(ren) Kelly Rowland and Michelle Williams, and, of course, her own sister Solange.

Bey wore a pair of one-legged pants with a bell-sleeved midriff shirt and later changed into hot pants for the official bringing out of the cake, while her husband Jay Z spent the night dressed like Jimi Hendrix.