01/04/2012 05:15 pm ET Updated Jan 04, 2012

Leah Messer Of 'Teen Mom 2' Pregnant & Engaged To Jeremy Calvert: REPORT

"Teen Mom 2" star Leah Messer is reportedly pregnant again and engaged to her boyfriend of almost six months Jeremy Calvert, according to Us Weekly.

Messer, one of the teenage girls documented on MTV's hit reality series "Teen Mom 2," is already a mother of two. The 19-year-old has twin two-year-old girls, Aliannah and Aleeah.

"Leah just got engaged over the holidays and is pregnant with another child," a source told Us Weekly. "She is so excited!"

Messer was married to Corey Simms, the father of her twins, for approximately six months last year, before she filed for divorce in April 2011. Messer then began dating Calvert in August and in mid-December, she told Us Weekly that they "do talk about getting engaged."

Messer and Calvert have been sending loving messages to one another via Twitter and on Wednesday afternoon, shortly before the engagement and pregnancy report hit the Internet, Messer vaguely tweeted:

In related "Teen Mom" news, during an Indiana court hearing last week, fellow "Teen Mom" Amber Portwood confessed to the judge that she felt exploited by the MTV cameras and the docu-series, stating, "I want to quit, and I will."

No word yet on whether Portwood is actually quitting the show and no confirmation on Messer's marital status.