In addition to Montag and Pratt's upcoming bundle of joy, Whitney Port has a son named Sonny Rosenman, Kristin Cavallari has three kids, and Audrina Patridge just celebrated her daughter Kirra Bohan's first birthday.
While talking to E! News, Pratt opened up about all the Hills kids getting together, saying, "We got NFL superstar [Jay Cutler], Kristin Cavallari. Go marry into that family, please. And Kristin hooked Heidi and I up, so it would make sense."
He then added, "Liam, Sonny. We got the whole squad. I'm hoping they get their own series — The Hills Nickelodeon."
But while it's been a happy time for all the Hills families, Pratt hasn't been so lucky. His own sister took to social media to put him on blast.
Stephanie Pratt, 31, shared a quote on Instagram that read, "Some of the most poisonous people come disguised as family."
"They never cease to amaze me – good thing I always pray for my enemies," she wrote alongside the quote.
Switching over to Twitter, Stephanie began tweeting about her family, writing, "I have protected people over the evil things they have done - & I'm tired of it – tired of my parents living in denial. Time 2 tell the truth."
Pratt didn't appreciate the words and responded, "Can't beef with peeps who have mental problems."