The US Embassy hosted a cocktail reception in honor of designer Michael Kors last night in Paris, with invitees including Jennifer Hudson, Mary J. Blige, Zoe Saldana, Amber Heard, and Anna Wintour. The soiree marked his line's 30th anniversary, and Mary J. wowed the crowd when she performed "Family Affair" to celebrate the occasion. The get-together was one of many taking place during Paris Fashion Week. Several celebrities have been stepping out in the City of Lights for parties and runway shows, including Chanel spokesmodel Blake Lively and Kanye West. Jennifer, who shows off her newly svelte figure in the latest Essence magazine, didn't hang around long after the evening's festivities, though — the singer was already back in the States this morning!