Lily Allen and her sister Sarah Owen have been arguing 'for years'

The siblings are currently business partners after opening a clothing shop and designing a fashion line - both called Lucy in Disguise - together and although the pair love working together, they still have the occasional argument.

Lily told Irish TV show Xpose: "It has its ups and downs. I think in any start up business it's stressful and that just gets multiplied by the fact that we know how to argue, we've been doing it for years but it's equally as rewarding when really good things happen because you feel like you're sharing it with somebody who understands. It's great."

Lily and Sarah - who share the same mother, Alison Owen - were not close when they were younger and Sarah, who is older by five years has previously blamed their personality clash on the age difference.

She said: "I've spent a lot of time feeling frustrated because I'm not particularly amazing at any one thing.

"I think Lily was angry at me for a lot of the stuff that happened in our childhood. I'm five years older so I was having my whole teenage experience just as Lily was forming her opinions.

"She was not the little sister I expected at all. When mum was pregnant I thought I was going to have an adoring sister who wanted to be guided by me.

"But it became clear really early on that Lily was a fiercely independent spirit who would take guidance from no one."

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