Britney Spears' ex-husband Jason Alexander was arrested Thursday at the Ventura County home the pop star shares with fiancé Sam Asghari.

Alexander, who was married to Spears for 55 hours after a 2004 Las Vegas wedding before the marriage was annulled, was chased and detained by security after he showed up at the residence, a Ventura County sheriff's spokesman said.

The sheriff's department was called to Spears’ residence in Thousand Oaks around 2 p.m. about a trespasser, the spokesman said.

Alexander, 40, was initially arrested on suspicion of an outstanding felony warrant out of Napa County from 2016, the official said.

He was subsequently arrested on suspicion of misdemeanor battery, vandalism and trespassing in Ventura County, he said.

An emergency protective order was issued late Thursday requiring him to stay away from Spears, the spokesman said.

The Napa warrant was for grand theft and buying or receiving stolen property, Napa County sheriff's spokesman Henry Wofford said.

Alexander was being held in Ventura County. Bail was set at $20,000 because of the outstanding warrant, Wofford said.

Spears, 40, was freed from her conservatorship in November after a judge ruled in favor of termination, ending the 13-year arrangement, which had legally stripped her from making her own personal and financial decisions. 

In 2020, Alexander showed up at a #FreeBritney protest in Los Angeles during her conservatorship battle. "I’m here to show support for the #FreeBritney movement and Britney,

he told Us Magazine at the time. "This is an unfortunate situation that’s been in her life for a long time. It’s affected me and her, and that makes me part of it."