Forget keeping up with the Kardashians... they're keeping up with the Biebs!

Kim Kardashian and Kanye West went to the Justin Bieber concert on Monday night, and they clearly enjoyed themselves so much that they returned for a second show on Wednesday with Kourtney, Kendall, and Kylie in tow. Yeezy previously tweeted that JB put out his favorite song of the year, and he must have really meant that. Who know Ye was such a die hard Belieber?!

After the performance, the whole gang afterpartied with the Canadian sensation at Warwick in Hollywood. We would die to be a fly on the wall for that! It really does seem like Kourt and the "Sorry" crooner must be hooking up, because she can barely contain the smile on her face whenever she's around him. She also dressed extra sexy in tight black leather pants and heels, but she ruined the look with a stupid red hat.

We're sensing a Yeezus and Biebsus collaboration!