Kourtney Kardashian and Justin Bieber's alleged romance appeared to come to an end in April as the 22-year-old singer reunited with Hailey Baldwin and later struck up a romance with Nicola Peltz, but over the weekend, the rumored couple seemed to be back on.

According to a new report, the 37-year-old Keeping Up With the Kardashians star was spending time with her children, Mason, 6, Penelope, 3, and Reign, 1, in Miami with friends when she reunited with Bieber, who was in town for a couple of shows days ago.

"Kourtney is having a fun holiday weekend with her kids. She keeps enjoying the beach and the pool. She has been hanging out with friends, including Justin Bieber and Larsa Pippen," a source told PEOPLE Magazine on Monday.

Apparently, Kardashian and Bieber, who were first linked last October, crossed paths multiple times over the weekend, but kept their distance during a visit to LIV nightclub on Saturday.

"They weren't together. At LIV he sat in a skybox. She sat in DJ booth," another source told the magazine. "He didn't stay long on both nights and kept to himself – no mic or performance."

The following night, Kardashian and Bieber were seen together STORY nightclub together, where the singer was hosting an after party for his Purpose World Tour. According to the report, Bieber arrived at 12:30 a.m. to the club and quickly sang "Happy Birthday" to STORY owner David Grutman. Then, around 1 a.m., Bieber surfaced in the DJ booth with Kardashian.

Kardashian "was there for David's birthday," another source said. "At first Justin didn't pay any attention to her, but after wishing David a happy birthday he went right down to her table and brought her up to a private table behind the DJ booth."

In April, a separate source told the magazine that Bieber and Kardashian had reportedly been "hooking up on and off for a few months now."

"They have hooked up a few times, including recently. It happens in L.A. He has met her kids, but they don't hook up around the kids," the source said. "It's on nights when she has help and is able to go out."

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Kourtney kardashian, Justin Bieber, E!, Reality TV, Keeping Up With The Kardashians