With her jetset life and relentless partying, supermodel Kate Moss has come to rely very heavily on the dedication of Jade Davidson, the nanny who cares for her five-year-old daughter.

But, amid claims she often works 24 hours a day, 22-year-old Jade has resigned from the £500-a-week job.

Jade, the younger sister of Kate’s clothes-designer friend Sadie Frost, has cared for Lila Grace for two years.

Sources say the budding actress, who used to look after Sadie’s children, is “very attached” to Lila.

But she is tired of being on call round the clock and has found Kate’s rootless living arrangements difficult.

The model has not returned home after her split from singer Pete Doherty and lives in friends’ houses.

Kate offered Jade a pay rise to stay, but she turned her down. She will care for Lila until the end of her notice in January.

“Kate is in the middle of moving and is not living at her own house so it’s not a great time to be without childcare,” said a friend of Kate.

“Jade refused a pay rise and there is a tension between her and Kate now.”

Kate, 32, is selling her £3million London home in St John’s Wood and lives during the week at her friend Davinia Taylor’s home in North London. At weekends she has a room at Sadie Frost’s with her daughter.

“The last straw was moving to a small room in Davinia Taylor’s house,” said a friend.

“With Kate life is spontaneous. One afternoon they are going to Paris, the next week it’s America. Life is totally unpredictable. Kate isn’t happy Jade is leaving but there’s not a lot she can do.”

Kate shares custody of Lila with her ex, publisher Jefferson Hack.

A spokesman for the model declined to comment.

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