Is she or isn't she?!

We're starting to think Kylie Jenner (and Kris) are just f-ing with us, floating this rumor that the youngest in the Kardashian Klan is pregnant. Why'd Kylie go posting this selfie in a sports bra, showing off her bare belly and then delete it from Instagram just as pregnancy rumors are peaking? Because she's leading us on, people ...

And she posted a pic from Friday of the Malibu Wine Safari she did with BFF Jordyn Woods for her pal's birthday and Kylie had not-so-innocently, strategically lifted the edge of her long-sleeved tee to expose her hip and the side of her belly (below right). And there's no bump ... and a shot of her and their girlfriends in their Vegas suite all dolled up in robes and we see nothing ...

So why'd she wear a baggy T-shirt to the iHeartRadio Music Festival in Vegas yesterday? Because she's teasing us?