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Selena Gomez, Justin Bieber

Jason Merritt/Getty Images, Splash News

Justin Bieber and Selena Gomez have reunited once again.

The exes were back together last night for a birthday party for their mutual friend Alfredo Flores.

The 20-year-old "Boyfriend" singer and the 21-year-old "Come & Get It" songstress hung out together Monday night at Hollywood hot spot Bootsy Bellows. Bieber sported a black shirt and black baseball cap while Gomez looked pretty in a white dress. During the bash, Bieber, Gomez and all their pals danced and had a blast while celebrating their pal's B-day.

An insider tells E! News they could overhear Bieber and Gomez telling people they were back together as a couple. They were holding hands and showed some other PDA, but no over-the-top making out or kissing. They were together the whole night and left together at the end of the party.

As for Bieber and Gomez's seemingly back-together-for-the-moment relationship status, another source tells E! News, "He has been trying to patch things up with Selena...He does love her."

Reps for Bieber and Gomez declined to comment on their relationship.

Justin Bieber, Selena Gomez, Khalil Instagram

Instagram

Meanwhile, Bieber's pal Khalil who was also in attendance posted a video from inside the club where you can see the former lovebirds looking close while standing side by side. "Happy Birthday @AlfredoFlores!!!!" Khalil captioned the vid.

Additionally, Flores posted an Instagram photo of himself with Gomez during the party, writing, "Blurred night with these 2! Happy Birthday Me!"

And earlier in the day, Flores posted a pic of himself hanging out with Bieber pre-birthday bash. "Spending the birthday wit my brothers @quincy and @justinbieber! #2on," the birthday boy wrote.

—Reporting by Senta Scarborough and Baker Machado

Justin Bieber, Selena Gomez, Khalil Instagram

Instagram