Heidi Montag and Spencer Pratt are expecting a baby boy.

The reality stars – who already have four-year-old son Gunner togethe

had a gender reveal party where blue confetti cannons revealed the sex of the unborn tot, who is due at the start of December.

According to ‘Entertainment Tonight’ Heidi shouted at the event: “It’s a boy!”

She then admitted: “My whole intuition is off.” Spencer, 38, said: “I wanted whatever she wanted.”

The 35-year-old beauty admits she was hoping for a girl but her son is thrilled to be getting a baby brother.

Heidi added: “Growing up I always wanted boys and then recently,

I kinda started thinking, I don’t know, I kinda want a girl and having one of each.

For Gunner, he really wants a brother, so, you know, ultimately I want what would be the best for him and his life.”

I was crying. I ran upstairs like ‘Spencer, it says pregnant!’ Gunner was like, ‘Why are you crying? What’s happening?’ ”