Forget the lottery. The Metropolitan Museum of Art’s Costume Institute benefit gala is what you call a real Powerball. The annual party, this year celebrating the new $40 million Anna Wintour Costume Center and inspired by the Charles James: Beyond Fashion exhibit, had a theme of “White Ties and Decorations.” Taylor Swift donned an intricately detailed Oscar de la Renta gown, Kim Kardashian wore a relatively demure Lanvin dress while Kanye West sported a tux and tails. Some couples went the matching route: John Legend and wife Chrissy Teigen both repped Ralph Lauren, and Jay Z and Beyoncé wore Givenchy. Guests including Janelle Monae, Tommy Mottola and event co-chairs Bradley Cooper and Sarah Jessica Parker were treated to a performance by Frank Ocean, but the party didn’t stop when the gala ended. Jay, Bey, sister Solange, Rita Ora and ASAP Rocky all headed to the Top of the Standard for the unofficial afterparty. Meanwhile, Rihanna attracted an equally star-studded crowd at her afterparty at Up&Down a few blocks east: Naomi Campbell, Zoe Kravitz, Anne Hathaway, Lily Allen and Selena Gomez got pumped up when Diplo jumped on the mic, and danced to a DJ set by Jermaine Dupri till 4 a.m.