Stone began dating English Comedian David Walliams in September 2009. They announced their engagement in January 2010. They were married at London's Claridge's hotel on 16 May 2010. In November 2012, the couple announced that Stone was pregnant with their first child, due mid-2013. On 6 May 2013, Stone gave birth to a baby boy, Alfred. It was reported on 4 March 2015 that, following five years of marriage, the pair had decided to try a trial separation, after 'drifting apart'. On 9 September 2015, Walliams filed for divorce from Stone, citing "unreasonable behaviour". The couple were granted a decree nisi the next day, dissolving the marriage six weeks after the date of filing.