(Photo: Twitter/Leah Messer)Leah Messer and Jeremy Calvert

Leah Messer reportedly gave birth to her third child on Feb. 4 and a new report suggests that the reality TV star has stuck to her theme of "A" baby names.

The 20-year-old "Teen Mom 2" star reportedly had a premature birth, as the baby was not due until March 11, however mother and baby are said to be "healthy and happy." Messer and her husband of almost one year Jeremy Calvert reportedly named their baby girl Addalynn, according to HollywoodLife.com.

"Leah gave birth in the early hours of this morning (Feb. 4) to a beautiful baby girl," a close family friend told InTouch magazine shortly after the alleged birth. "Mother and baby are happy and healthy. Leah went into labor late last night, and the baby was born this morning."

Messer reportedly gave birth via c-section and while there were "difficulties," she is said to be doing well although she is yet to confirm any birth reports.

"She had difficulties during her cesarean section," a source said.

Baby Addalynn is reportedly the newest member of Messer's expanding family, which includes her twin daughters Ali and Aleeah Simms from her previous marriage to Corey Simms.

The baby news comes one year after news broke that Messer had suffered a miscarriage shortly after announcing that she was again pregnant with twins.

Messer was allegedly at her mother's home on a Saturday afternoon when she lost the baby, OK! reported.

"She was having extreme pain to the point where she couldn't get out of bed. Leah knew something was happening. She was bleeding and had body aches," a source told OK.

During the recent airing of Vh1's "Teen Mom 2" reunion show special, Messer admitted that she was still in love with Simms despite divorcing him in recent years. While she also revealed that she was open to reconciling, the mother of three is now said to be content with Calvert and completely over her ex.

"Your more than a lover, there could never be another to make me feel the way you do.❤ #MyBestFriend @Calvert505," Messer tweeted Feb. 20.