Spencer and Heidi plus one?

Not if Spencer Pratt has anything to do with it!

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.

"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.

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

Adds Jenner: "Scary."