Blake Lively at a Chanel Party

Chanel's 80th anniversary celebration of their Bijoux de Diamants fine jewelry collection brought a star-studded red carpet in NYC last night. Blake Lively arrived with husband Ryan Reynolds wearing a backless silver Chanel dress and her sparkly new wedding ring. January Jones was also in a look from the designer, as was Elle Fanning. January's Mad Men costar Jessica Paré made an appearance alongside a Chanel-clad Diane Kruger, who spent the afternoon shopping in the Big Apple before stepping out for the glamorous event. Alexa Chung and Rose Byrne were also on hand to fete the iconic brand. The celebrations will continue next week when an exhibit featuring Chanel's 1932 collection goes on display at the Museum of Modern Art.