Britney Spears has married fiance Sam Asghari, seven months after being freed from a conservatorship that she said had prevented her from getting wed.
The couple tied the knot in an intimate ceremony in California on Thursday.
But preparations were disrupted when Jason Alexander, who was briefly married to the pop star in 2004, was arrested after allegedly gatecrashing.
He streamed video on Instagram Live before the ceremony apparently from inside her home before being tackled.
Ventura County Sheriff's Department told the PA Media news agency an altercation had taken place with security officers, and Mr Alexander had been charged with four misdemeanour offences of trespassing, battery and vandalism.
"He was able to find his way onto the property and was confronted by security," a police spokesman said.