Justin Bieber, Selena Gomez 2013, Heavy PDA [PHOTOS]: 'Stars Dance' Songstress 'All Over' Her 'Heartbreaker' Ex-Boyfriend at 21st Birthday Party

By Jon Niles, Mstars Reporter | Jul 29, 2013 01:01 PM EDT

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.

"Once people didn't really give him any crap and saw that he was being helpful the PDA got more intense," the insider added.

Numerous sources have also reported that Selena and Justin left the birthday blowout at 2 a.m. together in the same car!

One of Selena's best friends was not at her party, though. Taylor Swift was nowhere to be seen and it might have been a good thing for the Biebs considering Swift does not want him around her.

What do you think of Selena and Justin PDA at her 21st birthday party?

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