Frankie Delgado and Jen Acosta Frankie Delgado and Jen Acosta

The Hills' Frankie Delgado is engaged, People reports.

The reality star popped the question to longtime girlfriend Jennifer Acosta on Valentine's Day in Cabo, Mexico, according to his rep.

The Hills' Kristin Cavallari expecting first child

"I would like to be the first one to announce this: Frankie is engaged! Congrats to my brother," Delgado's Hills co-star and BFF Brody Jenner tweeted Thursday.Delgado, 30, is the second Hills alum to get engaged in recent months. Kristin Cavallari got re-engaged to Chicago Bears quarterback Jay Cutler in the fall and is pregnant with their first child.