Holly Montag is expecting her first child.

'The Hills' Cast: Where Are They Now? [PHOTOS]

Over four years after The Hills' final episode aired, Holly, the sister of main cast member Heidi Montag, is with child. The pregnancy comes just months after Holly and her husband got married.

Holly "is expecting her first child with husband Richie Wilson," toofab reported on Tuesday. "[Holly] and Richie tied the knot in Crested Butte, Colorado back in September, and her younger sister, Heidi Montag, served as a bridesmaid on her big day."

Heidi Montag & Spencer Pratt Are Planning For Baby

Holly was brought aboard The Hills during the show's fourth season. Throughout the episodes, Holly was seen living with her sister and Spencer Pratt, as well as developing a relationship with Heidi's arch nemesis, Lauren Conrad.

In addition to Holly's baby news, Heidi recently announced her own plans to conceive.

In the new issue of In Touch Weekly, Heidi said she's ready for a baby, and hopes she and her husband, Pratt, will have baby news of their own by the end of next year.

Although Pratt initially didn't want children, he recently changed his mind. As Heidi told the magazine, "When he saw how important it was to me, it changed his heart.”

After Holly's news was announced, Heidi took to Twitter, where she congratulated her sister and brother-in-law on their upcoming addition to the Montag family.

"Couldn't be happier for my sister @hollymontag Christmas miracle!!!!!" Heidi wrote. "Love you!!!"