Gisele Bundchen and Tom Brady already held the title of Cutest Couple in our book, but now, they've taken it to the next level -- the unreasonably hot duo is now engaged to be married.

Reportedly, Tom Terrific popped the question to his Brazilian babe on a private jet (no word on whether it was her personal jet or not). But wait -- it gets sickeningly cuter. The proposal happened on Christmas Eve, and onboard the plane were Bundchen's parents, four dozen white roses, and champagne. And, we presume, a diamond ring the size of a head of lettuce.

The toothy twosome, who have been dating since late 2006, is planning a sure-to-be gorgeous March wedding in Costa Rica, where Bundchen has a vacation home. What we wouldn't give for an invite to that event!