At one time they were said to be at war over their rival fashion ranges, but it appears that any past arguments have been long forgotten.
Instead Kate Moss and Lily Allen walked arm-in-arm as they arrived at the Chanel Party in Paris last night.
Laughing and joking together, the two appeared to have put any past arguments aside.
Fashion forward: Lily Allen and Kate Moss head to the Chanel party in Paris
Their friendship is perhaps unsurprising - they both have an interest in fashion and enjoy a good party.
Back in 2007 there were rumours the two had argued after Lily launched a fashion range for New Look at the same time as Kate introduced her first Topshop range.
Two years later and Kate's range is still going strong - while Lily's has not been recommissioned.
New best friends: Lily joined Kate and her boyfriend Jamie Hince for the party
However Lily doesn't appear to begrudge her rival's success, with the two even wearing matching green rings last night.
dailymail