Lily Allen rocked a pair of Prada platforms today as she arrived at the St. James the Great church in Cranham, England, for a wedding rehearsal. She's tying the knot with boyfriend of two years, Sam Cooper, tomorrow and is more than excited! She wrote on Twitter that, despite anxiety over having a zit, "I'm great, I'm getting married — eek!" Lily's dad, the actor Keith Allen, was on hand to take part in this afternoon's rehearsal, as was her brother and usher-to-be Alfie. She and Sam have apparently invited 300 people to the service and party, which will be held at Lily's country home not far from the chapel. Lily will wear Chanel for the ceremony, a fitting choice considering that she was a model for the brand back in 2009. Lily and Sam are looking forward to the vow exchange after what's been a rough year with the miscarriage of their child last November. She picked herself up after the devastating event and has lately been busy launching her Lucy In Disguise label. Lily wore one of her own dresses with family and friends today, though tomorrow she'll be in the competent hands of Karl Lagerfeld.