While everything seemed just friendly when we saw Kendall and Bieber's Instagram pics from that night, their fun was reportedly more than that. "Kendall and Justin were inseparable for most of the night. Justin has always been good friends with the Kardashians, so he and Kendall go way back," a source told The Sun.
"As soon as Justin arrived he made a beeline for Kendall the moment he spotted her. They were seriously flirting and kept going in and out of a photobooth together. There was lots of laughing and teasing and they were taking endless selfies," the insider continued.
We saw a lot of those after they were posted online shortly after their time together. There wasn't any PDA displayed, though, and there's was definitely some going down.
"After partying for about two hours they quietly slipped out of the party together and were seen holding hands," the same source added. Hmm...
Justin and Kendall dating rumors started swirling a few months ago when he was spotted out and about with her in New York City. Around that time his ex Selena Gomez unfollowed all the Kardashian/Jenner crew on Instagram...Coincidence?
Do you think Kendall and the Biebs are more than just friends? Think they should date?
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Gallery | Justin Bieber's Famous BFFs