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Rob Lowe, Twitter

Twitter

Happy Birthday, Rob Lowe!

Can you believe the hunky actor turns the big 5-0 today? Yeah, neither can we.

And in honor of his official AARP status, the organization welcomed The West Wing stud to the 50-and-over club (despite the fact that he seemingly doesn't age) with a cheeky chalk art sketch which was drawn around New York City at four various location.

The drawing features a Twitter-style birthday message which says, "Happy Birthday @RobLowe Welcome to the club! Love, @AARP #Boomers50," along with an illustration of Lowe's flawless face.

Rob Lowe

Dan Steinberg/Invision for Warner Bros./AP Images

And apparently, Lowe took the milestone birthday tribute in stride as he even tweeted a photo of one of the illustrations in the Big Apple.

"Soho sidewalk! What does it say when one's birthday becomes 'street art' on the other side of the country?" the Parks and Recreation star captioned the pic.

And when one of his loyal Twitter follower replied to his question, suggesting, "the East Coast version of a Hollywood Star on the sidewalk?" Lowe responded, "You solved it! Thanks!"

No word yet as to how Lowe's celebrating, although he did tweet about his milestone birthday, which just happened to fall on the same morning as the 4.4 magnitude earthquake that shook California.

PHOTOS: Rashida Jones and Rob Lowe's Parks and Recreation farewell

Rob Lowe, Instagram

Instagram

"If I had any remaining doubt that turning 50 was seismic, this a.m.'s Hollywood earthquake made the point! #TheBigOne," he wrote.

Most recently, Lowe has been hard at work on the upcoming TV movie The Pro, which also stars Rebecca Romijn and Rob Riggle. The comedy centers on a pair of former professional tennis players who are reunited at a pro shop after a major falling out, and the actor shared an Instagram photo on set with tennis queen Mary Carillo on Friday.

He's also gearing up for the release of his second tell-all memoir, Love Life, which hits shelves April 8.

Looks like he has lots to look forward to on a very special birthday! Welcome to the club, Rob (And don't worry, you're in good company. Looking at you, Brad Pitt.)