Sienna MillerKate Moss and Sienna Miller put aside their differences for the greater good on Friday when they attended a charity event together with their hairdresser James Brown.

The two women initially fell out when Sienna started dating Jude Law, the ex-husband of Kate’s best friend Sadie Frost, in 2004 but things are said to have reached breaking point last year when Kate accused Sienna of stealing her style and her friend, Sienna’s now boyfriend Rhys Ifans.

However several tense run-ins, the two women are said to have buried the hatchet and attended a Cancer Research UK auction at the Marylebone High Street Cancer Shop in London, each arm in arm with mutual friend James.

A source explained: “They’re not best friends by any means but they’ve realised it would be better for everyone if they weren’t enemies.”

“Sienna never had a real problem with Kate so she was just happy when Kate extended the olive branch.”

“Kate’s still a little insecure about her, like she’s being replaced by a younger model, but she’s seen that there are real feelings between Sienna and Rhys so she’s not so concerned about that any more.”

“She also realised she was causing their mutual friends to take sides and that was making everyone uncomfortable. She feels this is the mature thing to do.”