( We’re sure we weren’t the only ones feeling a little betrayed when we saw that British songstress Lily Allen walked down the aisle in a Delphine Manivet dress and not one of her custom Chanel gowns. But hold off on boycotting the new Mrs. Cooper’s next album Turns out the sneaky singer DID wear a Karl Lagerfeld gown at her reception, according to DailyMail.co.uk. After the Chanel mastermind uploaded images of Allen wearing a wedding gown and holding a dress sketch, fans and