Britney Spears was reported "shaken up" after her ex-husband gate-crashed on the venue of her and Sam Asghari's wedding in Los Angeles.

On Thursday, the singer's ex-husband, Jason Alexander, trespassed on the venue, while recording his invasion on Instagram Live, E! News reported.

"I'm here to crash the wedding because nobody is here except Sam. Where the f--k is the family... So here's the inside scoop of the bulls--t wedding," Alexander said according to a screen recording circulating online.

Alexander was then arrested by the authorities. Britney's ex-husband reportedly had a warrant of arrest that stemmed from two felony charges from 2015.

"Britney expressed she's a bit shaken up after the incident that happened," a source told E!, adding that the pop star wanted her wedding day to "feel like a fairytale."

The insider also noted that everyone in the Los Angeles venue was shocked after what Alexander did, noting that the wedding schedule was way behind because everyone at the event had to stop and talk to the security and police about what happened.

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Britney Spears and Sam Asghari's Wedding

Jason Alexander trespassed the Los Angeles venue on the day Britney Spears and Sam Asghari decided to tie the knot after years of being together.

For her big day, Britney reportedly wore a gown created by Donatella Versace, whom she previously touted as one in charge of her wedding outfit. Another insider said the wedding dress featured an off-shoulder cap sleeve with a deep V-shaped slit in the leg.

The pop star's makeup was done by Charlotte Tilbury, and she completed her wedding look with jewelry from Stephanie Gottlieb.

"It was very private and romantic, everything she wanted... Britney has told Sam that he is her soulmate and that she is so grateful to have him, especially during these hard times," another source told the entertainment news outlet.

Britney Spears announced her engagement to Sam Asghari in September last year. The two first met in 2016 on the set of her "Slumber Party" music video.

Britney Spears and Sam Asghari Wedding: Here are The Guests on the Pair's Special Day

Several celebrities and personalities were present during Britney Spears and Sam Asghari's wedding on Thursday.

Madonna, Selena Gomez, Drew Barrymore, and Maria Menounos were reportedly in attendance on the special day, according to People.

Gomez reportedly wowed the guests with a blue suit, Madonna rocked a rainbow-hued dress, while Barrymore showcased her beauty in a brown, flowing gown.

Paris Hilton; her husband, Carter Reum; and her mom, Kathy Hilton were also in attendance when the pop star said I do to her beau.

However, Britney's family is not complete during the wedding. Spears' father, Jamie; mom, Lynn; and sister, Jamie Lynn were not in the venue.

Britney Spears' children, Sean Preston and Jayden James, whom she shares with her ex-husband Kevin Federline, were also not present, but Federline's attorney, Mark Kaplan, noted that they are happy for their mother.

"They are hopeful that Sam and Britney are starting a great future together... It's their night and they didn't want to take away from them," Kaplan underscored.

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Written By: Joshua Summers

WATCH: Britney Spears' Ex-Husband Jason Alexander Crashes Her Wedding - From E! News