So this James Harden and Khloe Kardashian thing is really happening, huh?

Over the weekend, Khloe showed up to a game at the Drew League to support the Rockets guard. She sat courtside and watched as Harden led his team to a victory.

And last night, Harden repaid the support by accompanying Khloe to her sister Kylie Jenner's 18th birthday party at Bootsy Bellows in West Hollywood, Calif.

It appears as though Harden really got into it once he got inside the club, too. During the course of the party, Post Malone performed his hit song, "White Iverson," for those in attendance. And as he did, Harden was front and center singing right along with him and essentially serving as his hype man:

Sing it, James! This guy really enjoys losing his mind in the club, eh?

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[via @PostMalone]