Heidi Montag to Lauren Conrad: "I Miss You"

Credit: Steven Lawton/FilmMagic; Christopher Polk/Getty Images for Got Milk

Heidi Montag wants her old BFF back.

The Hills star -- who filed for divorce from hubby Spencer Pratt last Friday -- was in a nostalgic mood on Wednesday.

"Watching old Hills [episodes]," Montag, 23, Tweeted. "I miss you @AudrinaPatridge and most of all @laurenconrad."

Neither Audrina Patridge nor Lauren Conrad responded to Montag's plaintive Tweets.

Former roommates and best friends, Montag and Conrad famously ended their friendship over Montag's boyfriend-turned husband Pratt; among other things, Conrad accused the couple of leaking a false rumor about a sex tape. When Montag attempted to mend the friendship, Conrad brushed her off on camera, quipping, "I want to forgive you -- and forget you."

Still, Conrad -- and Patridge -- did attend the couple's April 2009 wedding.

Citing irreconcilable differences, Montag filed for divorce from Pratt, 26, in a Santa Monica, Calif.

Spencer's explanation? "Well, some say if you can't handle the heat get out of the kitchen. Heidi couldn't handle King Spencer's fame so she got out of the marriage," Pratt told UsMagazine.com of his wife's momentous decision.