Justin Bieber showed off his smokin' hot body during a Beach day in Malibu, CA, on Thursday. Justin kept things cool, frolicking in the sand and flaunting his incredibly toned body in **thing but his black boxer briefs. The 21-year-old singer and his killer abs looked straight out of a Calvin Klein ad. During his time in the sun, Justin even stopped to pose for a selfie with a young fan.