It seems like all The Hills alums are settling down!

Doug Reinhardt popped the question to his high school sweetheart Allie Lutz during a New Year's vacation to Anguilla, and the bride-to-be took to her Instagram to show off her gigantic rock!

The blonde beauty captioned the pic, "Cat's out of the bag," as she held up her engagement ring and received a smooch from her new fiance.

Reinhardt used to be quite the ladies man in Hollywood! He famously dated Lauren Conrad in 2008 before moving onto troubled starlet Amanda Bynes. His most famous ex is none other than Paris Hilton!

We think Dougie and Princess P make a way cuter couple, but congrats you two!