Celebs attending the wedding included Gwen Stefani, Ashlee Simpson, Kris Jenner, the groom's twin brother Benji Madden and Samantha Ronson . Nicole, 29, and Joel, 31, who have been together for several years and have two children, wed in Los Angeles at the estate of her father Lionel Richie, which was tented for the nuptials, on Saturday, Dec. 11.
