Sadie Frost flies out to keep eye on 'out of control' Kate Moss

The supermodel is having a wild time in Spain, throwing all-night parties on yachts and boozing almost 24/7 with a huge gang of mates.

But all of that is set to come to an end as we can reveal that Kate's best pal and social conscience, Sadie Frost, is said to be so worried Kate's out of control that she's jetting out to Marbella to keep an eye on her.

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Sadie had no plans to join the gang in Marbella but, after speaking to Kate every day, we're told she's so concerned she's postponed her plans to spend this weekend with her kids in Cornwall and she's jetting out to the Costa del Sol to look after Kate instead.

A well-placed source said: "Kate is having a wild time in Marbella, they're out every night, drinking loads and she's really letting her hair down.

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"But Sadie is worried Kate's just having a kneejerk reaction to losing Pete. She's been on the phone to her daily, counselling her and telling her to be careful.

Apparently Kate seems a bit manic out there, she's weeping a lot and Pete is brought into every conversation.

"Sadie believes this is a crucial turning point for Kate and that this time she may actually kick the Pete habit but she needs to be very careful."

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Kate is out in Marbella with her pals Kelly Osbourne, Davinia Taylor, Rhys Ifans, Holly Davidson and Rose Ferguson, while Sadie was supposed to be spending most of the summer in Cornwall.

And contrary to recent reports which claimed she was already in Spain with Kate - Sadie spent last weekend in London looking after her kids while their father Jude Law was in LA.

However, sources say Sadie has decided to change her family plans at the last minute so she can come to Kate's rescue.

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She'll fly out this weekend to watch Kate for a few days and give her moral support.

When Sadie's not around to keep an eye on Kate, the job usually falls to Sadie's youngest sister Jade Davidson, who's Kate's long-term nanny.

Sources say Kate is always bemoaning the fact that she can never hide from Sadie because Jade is always by her side, reporting back to big sister.

But Kate's decision to leave her daughter Lila Grace at home with her dad Jefferson Hack this week meant Jade didn't have to travel to Ibiza - so Kate's free to do as she pleases.

Kate and Sadie have had a very up-and-down relationship ever since Kate started going out with junkie Pete Doherty.

Sadie has never hidden the fact she doesn't approve of the Babyshambles frontman.

But now that Kate and Pete have split the girls have become very close again and Kate's really leaning on Sadie.