Holly Montag has welcomed her first child.

'The Hills' Star Announces First Pregnancy

Eight months after marrying husband Richie Wilson in her hometown of Crested Butte, Colo., Montag has become a mother.

"Former Hills star Holly Montag welcomed her first child with her husband Richie Wilson on Sunday, May 3," a source revealed to Us Weekly on Wednesday. "Heidi Montag’s older sis, 31, named her 7-pound, 5-ounce baby boy Isaiah Hawk Wilson."

Heidi Montag's Sister's Pregnancy Has Made Her Question Her Own Plans For A Child

In an interview with Us Weekly earlier this year, Montag's younger sister, Heidi, revealed how seeing Holly pregnant changed her own plans for a family.

"I was like, 'I think I can put this off for a little bit because you look REALLY uncomfortable!'" Heidi explained. "I was like, 'I'm three years younger. Maybe I can wait three more years to catch up.'"

"She is miserable!" Spencer Pratt added of Holly's pregnancy in March.

Prior to witnessing her sister's pregnancy, Heidi told In Touch Weekly she and Pratt planned to get pregnant by the end of 2015 -- despite Pratt's initial hesitations.

“He told me, ‘I don’t want to have kids,’ and I started crying. When he saw how important it was to me, it changed his heart,” she told the magazine.

“Spencer will totally be the softy,” she added. “I’m definitely going to be the disciplinarian.”

Following her time on The Hills, Holly spent time working as a comedian in Hollywood.

Tags: holly montag MTV Reality TV The Hills Heidi Montag Spencer Pratt