Lily Allen has "completely blown" her wedding budget.

Lily is obviously thrilled about marrying Sam

The 'Not Fair' singer is set to marry fiance Sam Cooper on June 11 and while she initially wanted the nuptials to be a small affair, they have now become a lot bigger as she doesn't want any expense spared for her big day.

A source close to Lily - whose wedding dresses is being created by Chanel designer Karl Lagerfeld - said: "I think the wedding dress itself is going to cost a small fortune. And her sisters, Teddy and Sarah, who are bridesmaids, are getting Chanel dresses too. If there was a budget for the wedding, it's been completely blown. It's gone from a small intimate family do with close friends, to something huge. There are so many people Lily feels she needs to invite. She also wants the champagne to flow and the food to be amazing."

Friends claim Lily is getting obsessed with the wedding and is often up all night finalising plans.

The source added to more! magazine: "Lily is obviously thrilled about marrying Sam. I'd say he's the love of her life and, of course, she'll want the day itself to be perfect. She's staying up all night, writing lists and constantly chopping and changing the seating plans and other details."