"So much fun catching up with @kristincavallari !" Pratt captioned the photo, along with a heart emoji.
Cavallari shared the same photo on her own Instagram Wednesday, writing, "This girl. Love her and that cute little belly. Thanks for coming by @heidipratt."
If she's thanking her for "coming by," I hoped that meant the Pratts were exploring Nashville — I'd love to see how they did the South. But Entertainment Tonight explains that Heidi Pratt came to a pop-up for Cavallari's jewelry company, Uncommon James.
Cavallari's family recently moved to Nashville, though her husband, Jay Cutler, will be away in Miami during the 2017 NFL season, since he was recently signed to the Miami Dolphins.
The former "villain" of The Hills' final season isn't the only one sharing in the Pratts' joy about their forthcoming baby, either. In May, Heidi Pratt told E! News that Audrina Patridge congratulated her on her pregnancy, as did Cavallari. (Apparently, she didn't hear from Lauren Conrad about the news, though she believes she was a good friend to Conrad.)
Spencer and Heidi Pratt haven't revealed the name of their forthcoming child yet, but Spencer recently said he had to nix a few names for a very fitting reason. Spencer checked whether potential names were available on social media — and if those handles were already taken, they ruled that name out.