Article continues below advertisementLily Allen is living her best life as a single woman.The "Smile" singer, 40, flaunted her lean physique in a racy lingerie campaign for Intimissimi.Allen serves as the new face of the brand and kicked off the partnership with a series of sultry snaps.Article continues below advertisementSource: Courtesy of Intimissimi/MegaLily Allen is the new face of Intimissimi.