Heidi, 26, and 28-year-old Audrina met up for drinks in Santa Barbara, California, after making contact with each other on Twitter.
Audrina had asked her fans if they knew of any good wineries in the area, and Heidi came to her rescue.
"What are some good Santa Barbara wineries?... Any suggestions..." Audrina had asked. Heidi replied: "I do! I'll take you!"
And it appears Audrina took her former co-star up on her offer.
Last night (12 August), Heidi tweeted a message to Audrina alongside little pictures of a wine glass, a flamenco dancer girl, a heart and a smiley face.
"@AudrinaPatridge I had so much fun seeing you! Let's do it again soon!" she said.
Audrina replied: "@heidimontag it was a lot of fun catching up!!:)! Santa Barbara is beautiful.. let's do it again soon xoxoxo"
Heidi and Audrina's mini reunion came after MTV aired an alternative ending to The Hills in America (watch it here).
The 42 second clip featured Brody Jenner and...Lauren Conrad!
Are you surprised Heidi and Audrina are still in touch? Tell us below, as the best comment from across the website each week wins £50!