The "Lights" singer, who unfortunately wasn't available to perform this weekend due to her touring schedule, previously sang at Prince William and Kate Middleton's wedding in London.
Sources tell E! News that the bride looked beautiful in her wedding dress as she headed to the ceremony this afternoon flanked by her bridemaids who wore vintage-themed gowns. Lauren wore pearls with her long, blonde hair falling loose around her shoulders.
Paul got ready for the big three-day celebrating by posting, "And so it begins #mrmrspaul" on his Twitter Friday with a photo of the two getting ready.