After stealing the show at the Met Gala with a stunning yellow gold Guo Pei gown, Rihanna bared a breast in a sheer black number for her own party, where she performed three tracks and mingled with the likes of famous exes Selena Gomez and Justin Bieber, Vanessa Hudgens, Lily Collins, Jennifer Lawrence, Jessica Chastain and Jenner sisters Kendall and Kylie.

Meanwhile, Lady Gaga staged a party on a bus which transported stars like Jessica Alba and Kristen Wiig to a fashionable post-Met soiree at the Paramount Hotel in New York.

Meanwhile, the official Metropolitan Museum of Art gala afterparty at the Boom Boom Room in New York City's Meatpacking District was the scene of one of the most talked-about moments of the night after Katy Perry was spotted smooching ex-boyfriend John Mayer.

The star-studded party featured guests including Leonardo DiCaprio, Bradley Cooper, Sean 'Diddy' Combs and Gomez and Alba, who were party hopping.