Ashley Greene and Kellan Lutz hit their respective gyms yesterday. While they weren't working out together, the onscreen siblings always make a sexy twosome, and they're going to be in great shape for their next shirtless and bikini faceoff. Ashley was on a break from her week full of dates with boyfriend Joe Jonas, which included a birthday celebration for Frankie. She seems to be part of the Jonas family these days, though we'll see how the long-distance thing holds up when she's off filming Breaking Dawn. Kellan, on the other hand, has been focusing on his physique more than public outings with his lady love, AnnaLynne McCord. The two are always off and on, so perhaps they're cooling things down before Twilight time.