Oh, baby! Rob Lowe proved that he’s still one of Hollywood’s hunkiest heartthrobs after he shared a sexy snap of himself working out. The West Wing star took to social media on Wednesday, April 9, to show off a toned tummy and a pair of muscular arms while doing a bicep workout … shirtless!

The 55-year-old posted the pic to promote his new show, Mental Samurai, that premiered in mid-March. Take a look at the snap Rob shared below!

Rob’s steamy photo garnered the attention of thousands and received hundreds of comments about the Parks and Recreation actor’s flaming-hot figure. “Wowzers! I’ll be watching! You’ve kept my heart pumping since the 80’s,” one fan wrote in the comments. “Are we really supposed to believe you’re 55?” joked another with a laughing-face emoji.

While many of Rob’s followers had to wipe the drool from their faces (including us), surprisingly not all were pleased by the generous pic. “This is the worst thing that has ever happened to Instagram,” Rob’s son, 24-year-old John Owen Lowe, hilariously commented on the post. Ha!

The Golden Globe-winning actor has been stealing fans’ hearts ever since he made his acting debut on ABC’s short-lived sitcom A New Kind of Family at just 15. As he gets older, Rob seems to be pulling a Benjamin Button and aging in reverse. In fact, the handsome hunk recently admitted he’s “vain as f–k” because every time he looks in the mirror he sees him as his 28-year-old self!

Rob Lowe circa 1983 in New York City
Getty Images

“I feel exactly like that guy. And I see him,” Rob revealed to Men’s Health in late January. “I’m fitter than I’ve ever been. More experienced [and] smarter. I’m not looking at a 20-year-old kid in a cape as my due north. I’m looking at a guy like [Bruce] Springsteen.”

Not only has Rob gotten himself into tip-top shape thanks to a new workout regime, but he’s also been able to combat his past struggles with alcohol addiction. “It became an outlet for all of the tension, stresses [and] compulsivity,” the actor, who has been sober for nearly 30 years, candidly admitted to the magazine. “I funneled the addiction, frankly, into that.”

Way to go, Rob!