The Jonas Brothers musician and former model Blanda had dated for around 20 months before calling it quits recently.
A rep confirmed the break up but didn't give any further details, only saying that it was "amicable" and they remain friends.
Joe, 24, and Blanda, 29, were pictured together as recently as 8 July, while out with friends in Los Angeles.
Musician Joe hasn't made any reference to the split on Twitter, where he has more than seven million followers. Instead, he's been gushing about his recent experience at Lollapalooza.
Joe swapped singing for DJing at the musical festival, whipping the crowd into a frenzy at the Sound Of Your Stay Music Lounge at the Hard Rock Hotel in Chicago.
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