If we were the Starboy, we'd be shaking in our boots!

Selena Gomez and Justin Bieber reconnected and spent some time together at her Studio City home in LA on Sunday, TMZ reports. The site got pics of The Biebs arriving at her pad in his white G wagon ten minutes before she got home, and the pair allegedly hung with pals until almost midnight!

They swear nothing shady is going on, though! In fact, SG's boyfriend The Weeknd was fully aware of the hangout, and was totally cool with it. The only reason he didn't join in is because he is currently on tour. He must be super confident!

The former lovebirds hadn't been speaking for over a year, but got back into contact after the "Come & Get It" songstress' secret kidney transplant surgery this summer.

"Selena realized life is fragile after her medical scare and that she shouldn’t take anything for granted. It improved her relationship with The Weeknd, and it also made her realize she should patch up relationships with those that have been important to her in the past," a source dished to Celebrity Insider.

"That is why she went back to talking to Justin, that is why she made sure to get back in the good graces of Demi. She wants to repair friendships with people that are, or who were, important to her. Justin was her first love, and she would rather have some bond with him than nothing at all. She hopes they can be friends forever from this point forth," the source added.

We think it's only a matter of time before her Bieber fever flares up!