Actress Sienna Miller and model Cara Delevingne got up close and personal at Monday's (06May13) Costume Institute Gala in New York City by smooching for the cameras. The two stars were guests at the annual fashion extravaganza, also known as the Met Ball, which had a punk theme this year (13). The British beauties both opted to strut their stuff in studded Burberry outfits at the event, and were seen chatting and laughing on the red carpet before going into the ball. However, things got much steamier as the night went on, with new mum Miller kissing Delevingne on the lips for a set of pictures, which the model then posted on her Instagram page alongside the caption, "Studded love." The catwalk beauty also posed for a series of snaps with fellow celebrity guests including her best friend Rita Ora, Miley Cyrus, and Emma Roberts.