He was quickly removed from the wedding site by police.

Jason went live on Instagram where he was seen conversing with the event security and informing them that Spears had invited him to the wedding, as reported by TMZ.

The Pop star’s lawyer, Mathew Rosengart, the same lawyer who won her conservatorship case and also in attendance, told Page Six that Jason has been “handcuffed, taken into custody and arrested.”
“I express my thanks to the Ventura County Sheriff’s Department for their prompt response and good work,” he added.
On the other hand, a source present at the event said to the publication that “Britney is shaken but doesn’t want to let this get her down,” adding, “Everyone is thankfully safe, and Jason is no longer on the property.”

Jason and Britney were married in 2004. The vocalist documented to have their marriage revoked after only 55 hours from saying “I do.” The choice supposedly came after her folks raised worry about their unconstrained pre-marriage ceremony.
Reactions to First Husband, Jason Alexander, Interrupts Britney Spears And Sam Asghari's Wedding
Jason Alexander has now physically entered Britney Spears home, making it up to her second floor. This is sad. Sad for him and sad for Britney and her security team to have to deal with on her wedding day. Jeez.
@BritneyLawArmy
Jason Alexander has now physically entered Britney Spears home, making it up to her second floor. This is sad. Sad for him and sad for Britney and her security team to have to deal with on her wedding day. Jeez.
— Britney Law Army (@BritneyLawArmy) June 9, 2022
Britney Spears needs better security. How did Jason Alexander even get in that far, it’s like a mile long to even get into the house. This is scary. Arrest him, restraining order now.
@imaexaholic
Britney Spears needs better security. How did Jason Alexander even get in that far, it’s like a mile long to even get into the house. This is scary. Arrest him, restraining order now.
— ً (@imaexaholic) June 9, 2022
Mind you, Jason Alexander is about to be in jail for a longer period of time than his and Britney’s marriage lasted… Like why are you breaking into her home… 😭
@jaylambily
Mind you, Jason Alexander is about to be in jail for a longer period of time than his and Britney’s marriage lasted… Like why are you breaking into her home… 😭
— jay (@jaylambily) June 9, 2022
Me if i see jason alexander on the street
@jereBlackout
Me if i see jason alexander on the street
— Jere | BRITNEY'S WEDDING IS TODAY!! (@jereBlackout) June 9, 2022
pic.twitter.com/QtBvOfmXBB
Jason Alexander needs to be arrested. Anyone supporting his complete inappropriate and disgusting behavior is completely deluded along with him. #LeaveBritneyAlone #britneywedding @britneyspears deserves happiness.
@Nelson64
Jason Alexander needs to be arrested. Anyone supporting his complete inappropriate and disgusting behavior is completely deluded along with him. #LeaveBritneyAlone #britneywedding @britneyspears deserves happiness.
— Nelson (@Nelson64) June 9, 2022
So you mean to tell me that jason alexander was outside britney’s property since yesterday and today he literally entered her home and her security have done nothing??? Are u fffing kidding meeree
@RHOFreeBritney
So you mean to tell me that jason alexander was outside britney’s property since yesterday and today he literally entered her home and her security have done nothing??? Are u fffing kidding meeree
— Real Housewives of Free Britney Movement (@RHOFreeBritney) June 9, 2022
JASON ALEXANDER JUST BROKE INTO BRITNEYS HOME AND WEDDING TENT ON LIVE!!!!!!
@jordonwithtwoos
JASON ALEXANDER JUST BROKE INTO BRITNEYS HOME AND WEDDING TENT ON LIVE!!!!!! pic.twitter.com/Eq3A2u5VbU
— britney's wedding cake fondant roses (@jordonwithtwoos) June 9, 2022
Britney Spears when Jason Alexander tried to disrupt her wedding today
@TheDGrimmett
Britney Spears when Jason Alexander tried to disrupt her wedding today pic.twitter.com/v0lJzQxemQ
— David Grimmett (@TheDGrimmett) June 9, 2022
how the hell did jason alexander get inside britney's home???
@archiveney
how the hell did jason alexander get inside britney's home??? pic.twitter.com/bf6IVgBPqG
— britney archive (@archiveney) June 9, 2022
HOW did Jason Alexander even get this far?? Britney needs a new security team STAT
@britneytwit
HOW did Jason Alexander even get this far?? Britney needs a new security team STAT pic.twitter.com/I7h4aHqXEX
— BritneyTwit (@britneytwit) June 9, 2022