Pregnant Kylie Jenner Shows Off Her Slim Waist in Photo Shoot Throwback -- See the Pic!

Kylie Jenner is throwing it back!

The 19-year-old reality star -- who is expecting her first baby with rapper Travis Scott, ET learned last week -- took to Instagram on Monday with a throwback pic promoting her Mary Jo red Lip Kit color which flaunted her toned tummy!

"Throwback 😍 Mary Jo is the perfect red @kyliecosmetics ♥️," Kylie captioned the pic.

Meanwhile, if you throw it even further back, you can watch an excited 2013 Kylie open up about how she couldn't wait to be a mom!

Check out the video below for more.