There's going to be another member of the future "Hills" generation: Audrina Patridge is avec child!

The erstwhile MTV star -- who became engaged to her longtime boyfriend Corey Bohan last month -- excitedly revealed on Instagram that she will soon welcome a brand-new addition to her brood.

"I finally figured out what to get Corey for Christmas!" the 30-year-old captioned the holiday-themed announcement/snapshot above (while holding a pregnancy test). "#babyontheway #ClearblueConfirmed #ad (blog post with all the details will be up today, couldn't wait to share the news with you all:)! Xoxo." Talk about the perfect present for the future husband and wife!

So how did Drina react when she saw the positive result?

"I was super excited!" the former Quixote Studios and Epic Records employee told Us Weekly, adding that the first person to find out was the proud papa-to-be. "I asked him to have a look at the test and make sure I wasn’t seeing things! You never really expect it to say 'pregnant.' He had a big smirk on his face and was really happy about it."

And soon, Drina's peanut will be in some great Tinseltown company -- specifically, Kristin Cavallari's three munchkins (Camden, Jaxon and newborn Saylor), Frankie Delgado's daughter Isabella and Holly Montag's son Isaiah.

Be sure to send your congratulatory messages to Audrina, Corey and their bundle of joy in the comments -- and for a fun rewind, see the soon-to-be parents go out for a date on the retro series below.