January Jones in YSL Pictures at Metropolitan Opera

January Jones, Emma Roberts, and Amber Heard all donned YSL last night to attend the NYC premiere of Jules Massenet's Manon at the Metropolitan Opera. The ladies picked different styles from the design house, with January looking stunning in a backless number, Emma in a jumpsuit, and Amber in a slinky silk gown. Who's your pick for best dressed on the Met Opera red carpet? Also in YSL for the event were Chloë Moretz and Emmy Rossum.

Emma tweeted about her fun times catching up with Chloë and her brother Trevor Moretz. January, meanwhile, broke from promoting the season debut of Mad Men to attend the musical evening. January headed to the Big Apple nearly two weeks ago with her young son Xander Jones. Sunday's premiere of Mad Men set ratings records for AMC, and made an instant star of Jessica Paré, who plays Don Draper's young wife Megan. Her rendition of the '60s song "Zou Bisou Bisou" turned out to be the show's most talked-about moment.