Leah Calvert became an aunt on Wednesday.

'Teen Mom 2' Star Leah Calvert Opens A Makeup And Photography Studio

Nearly five years after the MTV reality star became a teen mom to her twin girls, Ali and Aleeah, her younger brother, Isaac Messer, has become a teen dad.

On Wednesday, "Leah became an aunt when the girlfriend of her younger brother, Isaac Messer, gave birth to a baby girl," The Ashley's Reality Roundup reported on Thursday. "Isaac, who is still in high school, is now the proud father of Baily Amelia Messer. His girlfriend, Maddy Smith, gave birth to the baby girl at 4:12 p.m. Baily weighed in at 5 lbs., 6 oz, according to Maddy’s Twitter account."

Robbie Kidd Claims Leah Calvert Affair Did Happen: 'We Had Sex'

Messer and his girlfriend, Maddy, announced their pregnancy on Twitter in October.

In recent weeks, Messer has been in the news after he reportedly housed the man rumored to have slept with his sister during her marriage to Jeremy Calvert. According to reports, Messer lived with Robbie Kidd briefly several weeks ago after Kidd split with his ex-girlfriend.

According to a report by Starcasm last month, Kidd revealed on a radio program that he and Messer lived together up until early November, a month prior to their alleged hookup. He also claimed Calvert hadn't spoken to her brother after being advised to, reportedly, by her husband.

Leah Calvert has yet to tweet or post anything about Messer's new baby on social media.

Tags: Leah Calvert Isaac Messer Teen Mom 2