Chelsy Davy enjoyed a candlelight dinner with a group of pals in South London tonight. The blonde shared lots of laughs and looked relaxed during her evening out on the town, despite her role in what will be a historic event tomorrow. She will attend Prince William and Kate Middleton's wedding as her longtime on-and-off boyfriend Prince Harry's date! Chelsy is apparently wearing two different Alberta Ferretti dresses during the festivities, which will begin early in the morning and stretch well into the night. Meanwhile, reports that Kate has indeed selected a wedding dress by Alexander McQueen designer Sarah Burton have reached fever pitch. Today, a woman who resembles Sarah was spotted heading into Kate's hotel! Be sure to see the princess-to-be's gown when it makes its world debut, and join us starting at 12 a.m. PDT as we cover the royal wedding live, from the arrivals to the Kate and William's fairy-tale kiss!