Britney Spears' Ex-Husband Arrested After Breaking into Private Wedding Venue Hours Before Nuptials

Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Todd Williamson/Getty Images for dcp); Jason Alexander, former husband of Britney Spears arrives at the West Coast opening of artist Russell Young's art auction held at Minotti Los Angeles, to benefit The Art of Elysium, a non-profit organization of artists, who dedicate their time and talent to help at risk and hospitalized children. (Photo by Chris Farina/Corbis via Getty Images)
Britney Spears attends the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Todd Williamson/Getty Images for dcp); Jason Alexander, former husband of Britney Spears arrives at the West Coast opening of artist Russell Young's art auction held at Minotti Los Angeles, to benefit The Art of Elysium, a non-profit organization of artists, who dedicate their time and talent to help at risk and hospitalized children. (Photo by Chris Farina/Corbis via Getty Images)

Todd Williamson/Getty; Chris Farina/Corbis/Getty Britney Speras and Jason Alexander

Britney Spears is safe after her ex attempted to foil her big day.

The Ventura Sheriff's Department arrested Spears' ex-husband Jason Alexander on an outstanding warrant Thursday as he trespassed at the Grammy Award winner's private wedding venue hours before her planned nuptials to fiancé Sam Asghari, PEOPLE can confirm.

"She's freaking out over this," a source close to Spears, 40, tells PEOPLE.

Alexander, 40, Livestreamed himself on Instagram as he roamed around the property, revealing their wedding decorations, which were still being arranged by party planners. He could be heard yelling her name and claiming to security that he was invited to the wedding.

RELATED: Britney Spears and Sam Asghari Set to Marry in Intimate Wedding on Thursday: Sources

"So, here's the inside scoop, guys, of the bull— wedding. Jason Alexander, what's up," he said, greeting the workers and even shaking one's hand.

For more on Jason Alexander trying to crash Britney Spears' wedding, listen below to our daily podcast PEOPLE Every Day.

"My name's Jason Alexander. Britney invited me here," Alexander claimed. "Britney Spears invited me here. She's my first wife, my only wife. I'm her first husband. I'm here to crash the wedding."

EXCLUSIVE: Singer Britney Spears is currently embroiled in a fake tape scandal in which her ex-husband Jason Alexander is purportedly talking to her about her boyfriend boyfriend and manager Jason Trawick. Spears has since denied she is the woman on the tape. Pictured here are Spears and Alexander in happier times while getting married at the Little White Chapel in Las Vegas, after their 4am wedding ceremony on January 3, 2004. Pictured: Britney Spears,Jason Alexander Ref: SPL231602 031210 EXCLUSIVE Picture by: SplashNews.com Splash News and Pictures USA: +1 310-525-5808 London: +44 (0)20 8126 1009 Berlin: +49 175 3764 166 photodesk@splashnews.com World Rights
EXCLUSIVE: Singer Britney Spears is currently embroiled in a fake tape scandal in which her ex-husband Jason Alexander is purportedly talking to her about her boyfriend boyfriend and manager Jason Trawick. Spears has since denied she is the woman on the tape. Pictured here are Spears and Alexander in happier times while getting married at the Little White Chapel in Las Vegas, after their 4am wedding ceremony on January 3, 2004. Pictured: Britney Spears,Jason Alexander Ref: SPL231602 031210 EXCLUSIVE Picture by: SplashNews.com Splash News and Pictures USA: +1 310-525-5808 London: +44 (0)20 8126 1009 Berlin: +49 175 3764 166 photodesk@splashnews.com World Rights

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Spears' assistant Vicky T, who was alerted to the trespassing by fans on Instagram, has since provided an update, assuring that the bride-to-be was unharmed.

"I've done everything I can while being out of the country to keep everyone safe," Vicky wrote on her Instagram Story. "Thank you to all the absolutely amazing and incredible fans for alerting me of so much. You are blessings. Thank you. Everyone is safe."

The Glory artist was married to Alexander, a childhood friend, for 55 hours in Jan. 2004, after the pair eloped at the Little White Wedding Chapel in Las Vegas.

Britney Spears and Sam Asghari
Britney Spears and Sam Asghari

J. Merritt/Getty

Alexander previously pleaded guilty in January to violating an order of protection and aggravated stalking against an unidentified woman, TMZ reported at the time. He was given 11 months and 29 days of probation.

Sources told PEOPLE this week that Spears and Asghari, 28, were planning for an intimate wedding on Thursday, after they announced their engagement in September.

RELATED VIDEO: Britney Spears Is 'So Excited' About Wedding to Sam Asghari and 'Wants It to Be Perfect': Source

"Britney started planning and dreaming about her wedding shortly after she got engaged in November," a source told PEOPLE. "She has enjoyed the planning, but also felt stressed about it."

"It's a huge deal to her that she is finally able to get married. She wants it to be perfect. She is so excited that she feels overwhelmed. She is very emotional," the insider added.

Spears began dating Asghari in 2016 after he appeared in her "Slumber Party" music video.