Selena Gomez and Justin Bieber are supposedly “full-on back together”.

An Instagram video was posted by the Canadian heartthrob’s friend Khalil which shows Justin and Selena hanging out with each other at their mutual friend Alfredo Flores’ birthday party.

And a purported onlooker tells Us Weekly the pair “looked like a couple” at the bash because they were “all over each other” throughout the event.

"Justin and Selena are definitely full-on back together at the moment," another insider told the publication.

"They spent all day riding together on a Can-Am Spyder on Sunset Blvd. … Justin drove while Selena sat on the back holding on to [him]. He was incredibly sweet with her and they looked super happy and in love."

Justin, 20, and Selena, 21, first began dating in 2010, but they ended their relationship for the first time in 2012.

Since then couple have been breaking up and getting back together regularly, and their friends are apparently coming to expect this pattern from them.

"It is always on-and-off," a third source said. "Same story, every other week, every year. Now they are together again, next week they won't be. They never stop talking, even when you don't see them together -- that never changes. They fight, take a break, and then get back together. No surprise that it happened once again."

Reports have circulated for months Justin’s handlers are keen for the couple to reignite their romance.

“The agents say it is good for her to be next to him, keep him out of the bad habits,” Selena’s grandfather, Ricardo, previously told British magazine Heat. “They say she has been a positive influence on him. She’s doing all she can to get him on track.”

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