Sara De Boer / Retna Ltd. 1 / 9
Sara De Boer / Retna Ltd. 1 / 9

Spencer and Heidi plus one?

Not if Spencer Pratt has anything to do with it!

The Hills stars, then and now: see the surprising photos

In this clip from Tuesday's season finale of The Hills, Pratt has a basketball-court chat with pal Brody Jenner about his wife Heidi's sneaky attempts to get pregnant -- with or without his consent.

Heidi wants to be a mom! Find out what other stars are craving motherhood

"There's a chance that I'm about to be Pratt Daddy for real," he tells Jenner, noting that he found a pregnancy test in the trash.

Can you guess Heidi's bra size?

"It's like a sperm kidnapping," Pratt complains. "Like hijacking sperm!"

What should Heidi be most thankful for this holiday season?

Adds Jenner: "Scary."