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Leah Messer, Jeremy Calvert

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Dr. Drew Pinsky said this could happen.

Teen Mom 2 star Leah Messer is going down a familiar path—full of morning sickness, baby wipes...and wedding plans.

A source has confirmed to E! News that the 19-year-old is expecting her third child with boyfriend Jeremy Calvert. Strike that, we can now ID Calvert as Messer's newly minted fiancé!

The duo began dating in August, and Calvert reportedly popped the question with a 1.5 carat princess-cut diamond on Christmas Day. There's no word yet on how far along in the pregnancy she is.

Messer was previously married to Corey Simms, who is currently featured on the MTV reality show (remember, we watched them celebrate Christmas together last night with daughters Aleeah and Aliannah), before divorcing last April.

—Reporting by Katie Rhames