WTF?! Could Kourtney Kardashian really be pregnant with her FOURTH child?! And uh ... who would the daddy be? Is KK still hooking up with baby daddy Scott Disick, even though they've separated? I mean, Bieber's been gone for a hot minute, so we're guessing he's not the father :)

Kourtney was at the family gyno on Monday, playing with her T-shirt and drawing some attention to her mid-section. And you know us, we're all too happy to jump on the is-the-skinny-celebrity-pregnant train!