If you've ever wondered what it would be like to lock lips with Bradley Cooper [1], Sienna Miller [2] just might be able to fill you in. The actors shared a sweet kiss while filming a wedding scene aboard a boat for their upcoming movie, American Sniper, in LA on Friday. Donning a sleeveless white dress, Sienna wrapped her arm around Bradley as the suit-clad actor closed his eyes. Later, the two were seen smiling at each other as cameras captured what appears to be a reception scene. We first caught a glimpse of the costars together in mid-May, when Sienna debuted her new red hair [3] on set. Bradley, meanwhile, has made an even more drastic change — he reportedly packed on 40 pounds [4] for the role! Keep reading to see Bradley and Sienna's adorable movie wedding pictures.