Alexander, who was later arrested by police, broadcast the intrusion live on social media. He is said to have claimed that he was invited to the wedding. The actual wedding is reported to have been planned for a few hours later.
This is the third time Spears is getting married, 2004-2007 she was married to Kevin Federline who is also the father of her two teenage sons.
Spears and Asghari got engaged in September last year, in November Spears was released from a 13-year guardianship. In May, the 40-year-old singer announced that she had had a miscarriage after going out with the news in April that she was pregnant.
Sam Asghari and Britney Spears met in 2016 during the recording of a music video for her single “Slumber Party”. It is unclear whether Thursday’s wedding has taken place.