The Smile hitmaker was welcomed into the supermodel's inner circle in 2009, and they were snapped partying together in the U.K. capital and abroad.
They eventually drifted apart as Allen gave up her party lifestyle and stepped out of the spotlight to focus on motherhood, and Moss was reportedly left off the guest list when the singer married Sam Cooper in 2011.
In a Tv documentary, Lily Allen: From Riches To Rags, which aired that same year (11), Allen admitted: "I still have her number. I just don't call it very often."
However, the pair now appears to have revived the friendship. They were snapped enjoying a night out together at London's Chiltern Firehouse restaurant on Monday and the fun continued until the early hours of Tuesday morning (01Apr14).