This weekend, former couple Justin Bieber and Hailey Baldwin were spotted all over Miami together, fueling rumors that they were potentially (definitely) back together. A source told E! News that they not only attended a church conference together during the day, but they went out together every night(!).

Apparently, there was no outward PDA between the two when there were cameras around, but it was a different story ~ in the club ~. "Inside the club they were dancing and he had his arm around her many times," the source said. "They seem very close and comfortable together."

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They were "inseparable" the entire weekend, and according to another source, these two actually have more to talk about than meets the eye. "They both have two things in common: they love to party and they love their church organization," an insider told E! News.

The two planned to head down to Miami together for the church conference and decided to make a fun weekend out of it. "They have finally cleared the air and rekindled their friendship, and realized they genuinely have a lot of fun together," the source said.

And, the insider said they're both definitely single. Justin and Selena Gomez were back together earlier this year, but that ended, and his relationship with model Baskin Champion seems to be over, too. Hailey walked the red carpet at the Met Gala with Shawn Mendes, but she told The Times UK after the fact that she is single.

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Justin and Hailey have a long history, having known each other for years. Hailey told The Times UK in that same interview that they were just friends for a long time.

"Everybody knows that at a certain point in time that turned into something else, but that just happens when you're 18, 19. It was what it was," she said. "We went through a long period of time when we weren't friends. We didn't speak for quite some time and there was a lot of weirdness that went on. We've moved past that."

!!!!! TBD on whether this becomes official, but it certainly sounds promising.

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