First there were rumors that Britney Spears was getting it on with one of her tour backup dancers named Geo, and then she was supposedly boning another backup dancer, 21-year-old Chase Benz, and then there were claims that she was bumpin’ uglies with Kevin Federline, but this one has to take the cake — Britney is reportedly engaged to be married to real estate developer John Sundahl. NY Daily News says

40-year-old Sundahl met the pop princess in rehab in 2007 during Britney’s bald days and has held a torch for her ever since.

[His] personal pilot told us: “Britney and John used to date, but they reconnected after her show in New Jersey, and now they’re engaged. He got down on one knee in a Subway sandwich shop in Santa Monica a week ago and proposed with a $4.5 million marquise-cut diamond. They plan on getting married at his aunt’s farm in Germany in six weeks. It’s very hush-hush, even to the employees. He’s even putting a $350K fence around the property.”

Sundahl - who’s so wealthy that he’s currently staying at his parents’ house in Woodland Hills, California, [said], “Britney doesn’t want to do anything until the tour is over. She wants press for her tour and not for an engagement.”

Living with his folks and proposing in a fast food joint, huh? Yep, that sounds about right. The only part of the story that isn’t believable is the bit where they were eating at Subway. Anyone with half a brain knows Britney Spears wouldn’t be within a ten-mile radius of a restaurant that doesn’t serve french fries and Quarter Pounders. You might as well have told me he proposed at at Mensa meeting or inside the lost city of Atlantis.

More of bikini Britney in Miami with the kids last month: