Amber Heard, Tina Knowles and Lance Bass are among the stars working on a new campaign with Habitat for Humanity Los Angeles that's aptly named #Hammertime.Heard said she was 'excited' to team up with the nonprofit, in an Instagram post.Other notable names involved in the drive, according to People, include Tori Spelling, Holly Robinson Peete, Cassie Scerbo, Ian Chen, Charley Koontz, Krystin Goodwin, Breegan Jane, Alex Rose Wiesel, Walter E.
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