The BAFTA Awards may have come and gone, but the afterparties kept the stars celebrating all night long in London yesterday. After nabbing both the best picture and best director awards at the event earlier in the evening, Ben Affleck took Jennifer Garner to a party at the Grosvenor House hotel. Jennifer kept on her backless Roland Mouret gown, but bundled up in a black coat as she made her way through the chilly London streets. Meanwhile, Marion Cotillard, Amy Adams, and Bradley Cooper dropped by Loulou's to attend the Weinstein Company bash with stars like Jeremy Renner and Jennifer Lawrence. Marion, Jennifer, and Amy all kept on their dresses from the event, eschewing a dress change. Click through to see those stars and more partying away in London.