Prince William looked dapper in his red Irish Guards Mounted Officer's uniform as he arrived at Westminster Abbey today. He had his brother, Harry, by his side as they walked on the red carpet into the abbey following their ride through the mall, where they waved and smiled for the crowd. The man of the hour then made his way into the church where he'll await the appearance of his bride, Kate Middleton. William and Kate received their new royal titles this morning — the Duke and Duchess of Cambridge. Kate will make her wedding-day debut in just minutes, so stay tuned for more coverage!