Reality star Heidi Montag misses her former best friend and co-star Lauren Conrad. The former Hills star, 23, shared her sentiments on Twitter yesterday. Montag, who has allegedly recently filed for divorce from her husband Spencer Pratt, wrote: 'Watching old Hills [episodes].

The former co-stars were previously best friends, but their friendship came to an end after Conrad reportedly accused Montag and Pratt of spreading a false sex-tape rumour about her. Neither Patridge or Conrad responded to Montag's tweets.