Becky is back in her third Shopaholic adventure, a hilarious tale of mothers and daughters, mothers and sons, and one blushing bride who can`t say no to saying "I do." Life has been good for Becky Bloomwood - she`s become the top personal shopper at Barneys; she and Luke are living happily in Manhattan`s West Village; and her new neighbor is a fashion designer. When Luke proposes, bridal registries dance in Becky`s head. The problem is, Becky`s overjoyed mother has been waiting forever to host a backyard wedding, with the bride resplendent in Mum`s frilly old gown, while Luke`s high-society mother is insisting on a glamorous, all-expenses-paid affair at the Plaza.