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Stella McCartney can see a friend in her nanny (Getty Images)

Who wouldn't like the sort of mates Stella McCartney has? I don't mean Gwyneth and Rihanna (although I bet they're a right laugh), but pals who are altogether more, you know, useful. "I have a nanny, though I find that word jarring," Stella said in a recent interview. "I tell her: 'I just want to call you a friend'."

You know, one of those friends who spends their days wiping up after your children, ferrying them to school and back and making them tea. My buddies are fantastic, but they tend to be rather more up for drinking wine and moaning about work than providing full-time childcare. But then again, my pals only cost me the price of a bottle of pinot grigio and a couple of hours – presumably, Stella has to fork out a bit more for her "friend".