Kellan Lutz hit the boardwalk in Santa Monica on Saturday to take a stroll and skateboard ride with his family. Things got a little hot for the actor in the midday sun, and he stripped off his tee to reveal washboard abs while rolling by the water — Kellan's six-pack is also front and center in the new trailer for Immortals. Kellan was back home just in time to serve as a groomsman in his brother's wedding over the weekend, after his final trip to Vancouver for Twilight. Kellan, along with costars Ashley Greene, Jackson Rathbone, and Peter Facinelli, went north to wrap up work on Breaking Dawn last week. AnnaLynne McCord came along with Kellan on his latest trip to Canada, though she left him there in order to attend a recent pool party in Las Vegas. She and her sister, Angel, threw on their bikinis to cohost a party for their friend Sara Oriolo, who became a Mrs. Lutz when she married Kellan's brother Brandon on Saturday. AnnaLynne was also Kellan's date for Brandon and Sara's big day!