PRENUP OR BUST!

Before Tiger Woods even thinks of popping the question to girlfriend Erica Herman, he has to protect his $800 million fortune. According to a source, the golf champ, 44, will propose only if the 36-year-old agrees to sign an ironclad prenup. “Tiger loves Erica, and they’re practically married already,” the insider tells Star, “but he wants to be safe.” The former restaurant manager, whom Tiger met when she worked at his Jupiter, Fla., eatery, has reportedly had some money woes in the past — to the tune of $240,000 in debt. And Tiger has reason to be wary, after his $750 million divorce from Elin Nordegren, mom to his two kids. So, though the PGA winner’s committed to his girlfriend of two years, says the pal, this is one thing he won’t budge on: “It’s a take-it-or-leave-it deal.”