Get More: Beyoncé, MTV Shows

She's got that glow! 

Beyonce shows off her growing baby bump in a 30-second teaser for "Countdown." Jay-Z's pregnant wife also dons a retro, short black wig in the clip, standing in front of a black-and-white wall while moving her arms like a clock.

PHOTOS: Beyonce's bikini body

In the clip, the 30-year-old mommy to be sings: "If you leave me, you out of your mind."

So how is the chart-topping diva dealing with her pregnancy so far? "It is the most powerful creation for you to be able to have a life growing inside of you," she told the Associated Press last month. "There is no bigger gift, nothing more empowering."

Watch the teaser for "Countdown" above, and tune in to MTV Thursday at 7:56 p.m. EST for its full premiere.