Ab city! Britney Spears' boyfriend, Sam Asghari, shared a steamy shirtless shot, and fans can't get over his chiseled chest and his sexy six-pack. The 38-year-old singer's man left her fans drooling by posting the insane muscle shot and now Britney's Army is screaming for more! Asghari, who's 26 years old and a gym rat, wowed everyone when he captured a snap showing him working out in nothing but tiny army print shorts on Saturday. Posing for a sweaty mirror selfie, Asghari didn't even have to flex to get fans' blood boiling.