Former The Hills star Holly Montag is pregnant.

Heidi Montag's older sister is expecting her first child with husband Richie Wilson, People reported.

Holly, 31, and Wilson's baby is due in May 2015.

"Couldn't be happier for my sister @hollymontag Christmas miracle!!!!!" Heidi tweeted alongside a photo of the happy couple in front of their Christmas tree showing off Holly's prominent baby bump. "Love you!!!"

The mom-to-be and Wilson got married in September in Crested Butte, CO.

Back in 2009, Holly replaced Heidi and her husband Spencer Pratt on the second season of the American version of I'm a Celebrity...Get Me Out of Here!. Heidi's decision to quit due to controversy enabled Holly to finish the show in sixth place.

About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.