Which MTV Starlet Flaunted Her Bare Baby Bump on Twitter For Flashback Thursday? (PHOTOS)

16 and Pregnant's down-home gal gave birth to baby Gannon over a year ago, and she's already back to her super-slim physique. But in this flashback picture, she's rocking a serious baby bump adorned with a cute blue bow.

And the icing on the cake? Mackenzie's boyfriend-turned-fiance Josh was there to plant a loving kiss on her belly. "Gannon getting a kiss from daddy before he even came into this world. Josh always kissed my belly," she wrote on Twitter.

Aww! Fingers crossed these cuties make an appearance on Teen Mom 3!