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Baby #3 is on its way for Leah Messer -- and she's already showing!

The "Teen Mom 2" star announced her pregnancy last week and wasted no time debuting her baby bump to the world.

Messer, 20, took 2-year-old twin daughters Ali and Aleeah to the park near her home in West Virginia, where she showed off her growing belly in a brown t-shirt.

It's crazy how big her little girls have gotten!

This will be the first child for Leah and new husband Jeremy Calvert, who tied the knot in April. She reportedly suffered a miscarriage with the couple's first pregnancy back in January.

Leah's two girls are from her relationship with ex-husband Corey Simms.

See more expecting stars in the gallery above.

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