Britney Spears’ ex-husband to whom she was wed for three days in 2004 has been convicted of aggravated trespassing and battery at the pop star’s June wedding.

Jason Alexander, 40, pleaded no contest to the two misdemeanour counts in a California court.

The Ventura County judge sentenced him to the 64 days he has already served in jail.

Prosecutors dropped charges of felony stalking and misdemeanour vandalism.

Spears married longtime boyfriend Sam Asghari at her home in Thousand Oaks, California, on June 9, in front of several dozen guests including Selena Gomez, Drew Barrymore, Paris Hilton and Madonna.

Marriage over before it started

Alexander, a childhood friend of Spears she married in Las Vegas, appeared uninvited at the house before the ceremony while live-streaming on Instagram.

He got inside and up to the locked door of Spears’ bedroom when she was inside getting ready for the wedding, according to testimony at a preliminary hearing.

Alexander refused to leave the property when asked, battered a security guard who tried to remove him, and damaged a door, prosecutors said.

After he entered his plea, a judge issued a new protective order forbidding him from coming within 100 metres of Spears or the security guard.

Alexander’s attorney, Sandra Bisignani, did not immediately reply to an email seeking comment, but said in court there was no evidence Alexander had any intention of harming Spears.

The singer’s lawyer declined to comment.

-AAP