Matt Sayles / Invision/AP 1 / 12
Matt Sayles / Invision/AP 1 / 12

Nothing awkward here, folks!

Demi Lovato and ex-boyfriend Joe Jonas reunited backstage at the Nokia Theater for Sunday's MTV Video Music Awards -- and were all smiles.

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After a few months of dating, Lovato, 18, and Jonas, 21, broke up in May 2010.

In a statement to Us at the time, Jonas explained: "It was my choice to breakup, but I love her as a friend. She's been there for me when I needed her. I will continue to be her friend and be there for her."

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Then, in November 2010, Lovato abruptly dropped out of the Camp Rock 2 tour alongside her ex and his brothers to enter rehab for emotional issues.

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"I wouldn't credit my meltdown to a guy," Lovato told ELLE last month. "There was so much other stuff in my life."