Credit: John Shearer/Getty Staff

The Hills are alive with the sound of marriage proposals.

First, Jason Wahler of Laguna Beach and The Hills got hitched to fiancée Ashley Slack on October 12. Not to be outdone by her former flame, co-star Lauren Conrad announced her engagement to boyfriend William Tell, who popped the big question over the weekend. Now, you can add Holly Montag to the list of former MTV reality stars putting a ring on it.

That’s right — the sister of the notorious Heidi just got engaged! The 30-year-old kept a low profile on the MTV reality show despite appearing in 25 episodes of The Hills so, not surprisingly, it was Holly’s little sis Heidi who announced the happy news!

A HUGE congratulations to my amazing loving sister on her engagement to Richie! Answered prayers! love u so much & am so ecstatic for u!,” Heidi tweeted October 13.

Before meeting her husband-to-be, Holly quietly dated Justin “Bobby” Bresica, a fellow Hills star who was also tied to co-stars Kristin Cavallari and Audrina Patridge. It’s Holly’s younger sister who typically grab the headlines, however, what with her tumultuous relationship with husband of four years Spencer Pratt.

Now that Holly’s getting hitched, maybe Heidi and Spence will give her a few pointers on how to make a Laguna Beach relationship work. Gulp.

Sources: Us Weekly, Heidi Montag on Twitter

Elisabeth Kramer is an Assistant Editor at Wetpaint Entertainment and our resident Downton Abbey expert. Follow her on Twitter and Google+!