It's a Hills baby boom!

Spencer Pratt and wife Heidi are expecting their first child, they revealed to Us Weekly. The couple, who have been together for 10 years, are due on October 19.

As for how the blonde bombshell told her hubby she had a bun in the oven?

"The look on her face, I can’t even describe it. She was literally glowing. I thought she was about to say she made muffins or banana bread. Heidi said, ‘I’m pregnant.’ I was like, ‘Whoa, that’s way more exciting than banana bread!’" he told the mag.

"I felt nauseous and I wanted to know, so I took a pregnancy test. I was so shocked; Spencer wasn’t. He was so sure it would happen right away. He was like, 'You’re going to get pregnant the first time we try,'" Montag added.

Congrats Speidi!