Kanye West and Jay-Z Perform at Sweet 16 Party

Kanye West, who celebrated his 34th birthday last Wednesday (June 8) -- with a rumored make-out session with Mary-Kate Olson -- helped a couple of fellow Geminis celebrate their special day with a performance.

The 'My Beautiful Dark Twisted Fantasy' creator showcased his lyrical skills at the birthday party for Leslie Taylor and her friend Skakora Conley, who celebrated their Sweet 16 on Saturday (June 11). Taylor's mother, Chaka Pilgrim, is a longtime music industry vet and Jay-Z business associate. Jiggaman also joined 'Ye at the fête, which took place at New York City's Carlton Hotel, as did producer-singer Ryan Leslie.

The 'Black Swan'-themed party featured music by DJ Runna, stilt walkers, feathered and costumed human "mannequins," a "royal 16 court" by Diggy Simmons and ballerinas decked out in 'Black Swan' outfits, who all danced to Kanye's single 'Runaway.'

According to reports, moments after Ryan Leslie sang 'Happy Birthday' to the 16-year-old, Jay-Z and Kanye got on the mic together, driving the teenage crowd "crazy."

Check out photos of the party here.