In an interview on July 21, Selena Gomez revealed that she and Justin Bieber were not back together and that she was in fact single. So when here ex-boyfriend showed up at her epic 21st birthday bash on Saturday (six days later) it was kind of surprising when reports alleged that the two were taking part in a lot of heavy PDA. To be fair, Justin did fly across the country to make it to the party. He also brought Selena a single red rose.

CLICK HERE to see pictures from Selena's 21st birthday bash!

According to a source, Selena could not keep her hands off of her ex.

"She was all over him," the insider said. "They were definitely touchy-feely and shared some kisses and back rubbing."

This source also said that Selena was living it up and partying hard, eventually becoming a bit sick on her big day. Luckily for her, the "Baby" singer was there to rub her back. Selena's friends were definitely not thrilled when the Biebs pulled up in his leopard-print Ferrari, but "he was being helpful," so they warmed up to him being there.

You can see the full story at mstarz.com

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