Who's that guy, Kourtney Kardashian?!

The 36-year-old sent fans into a frenzy on Thursday when she posted a photo with a mystery guy and two of her three kids to Instagram. All four have their backs turned towards the camera, so we can't see the man's face.

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A post shared by Kourtney Kardashian (@kourtneykardash) on

Followers immediately began speculating over whether he's the reality star's new beau, but others are convinced it's Corey Gamble, Kris Jenner's longtime boyfriend.

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Though we can't confirm that it is in fact Corey, Kris later regrammed the snapshot, writing "Family" next to the pic — so it'd make sense if that was her man.

Kourtney was most recently linked to much younger pop star Justin Bieber, though she told Ellen DeGeneres last month that the two are "friends."

Who do you think the brunette beauty should date next?