He may not be very old, but Joe is already an accomplished musician and has weathered some very high-profile relationships!

Joe Jonas turns 22 years old today, Aug. 15, and he has a lot to look back on this year — including his splits from Demi Lovato, 18, and Ashley Greene, 24.

Joe made headlines when he split up with Demi Lovato in May 2010 while they were on tour after filming Camp Rock together. But the real drama didn’t start until Oct. 2010 when Joe brought his new girlfriend, Twilight star Ashley Greene along with him on the tour.

Demi had reportedly made threats to Ashley, before getting into a physical altercation and quitting the tour to voluntarily enter rehab. Naturally, everyone that that Joe might have had something to do with her meltdown, although they both deny it!

Joe and Ashley were often seen out and about together in LA and New York, and it seemed like Ashley was always on a plane to see her musician beau! The pair split in Mar. 2011, but it was reported that it was an amicable breakup.

Not only has Joe become well-known for his relationships, but he’s also taken his image from punky long-haired Jo Bro to a suddenly (VERY) buff dude. He got a hair cut, hit the gym and now he’s drop dead gorgeous!

His new look came around the same time as Joe decided to take a break from The Jonas Brothers and launch a solo career — So far so good, because his single ‘See No More’ featuring R&B artist Chris Brown is a hit with fans.

We’re still trying to figure out who the mystery girl is that Joe has been seen with recently, but word on the street is she was NOT in attendance and his birthday party this weekend at Haze Nightclub at the Aria in Vegas.