Sheridan Smith has celebrated her birthday a little differently this year, by cradling her newborn son in her arms.The Cilla actress - who has just turned 39 - shared an adorable snap with her first child, who she welcomed with her fiancé Jamie Horn back in May, to mark her special day. Sheridan has also appeared to let slip her son's name was Billy, after she mentioned him by name during a Radio 2 interview, according to one fan who was listening in to the show.