TMZ reports.
The 41-year-old was held in jail, and it was not immediately clear whether he was issued a bail amount or court date, the outlet adds.
It is also unclear who Alexander was accused of stalking.
In May, Page Six exclusively revealed he married a woman named Rebecca Bell.
The pair obtained a marriage license before officially tying the knot on March 27.
The nuptials came less than a year after he infamously startled Spears when he live-streamed himself breaking into the “Toxic” singer’s home hours before her June 2022 wedding to Sam Asghari.
Alexander falsely claimed the pop star had invited him to her ceremony before he was pinned down by security.
He then barged his way into the tent where the wedding was set to be held, declaring, “She’s my first wife, she’s my only wife.”
After initially resisting security, cops arrested Alexander upon arrival after he threatened to crash Spears’ big day.
Sources told Page Six at the time that the Grammy winner was “shaken” over the incident.
Alexander was ordered to stay at least 100 yards away from Spears for three years following the break-in.
He was ordered not to communicate with her in any capacity, including digitally.
He pleaded not guilty to trespassing and battery, but the DA also slapped him with a felony stalking charge, which was ultimately dismissed.
Under the protective order, he cannot possess weapons or guns and had to relinquish any firearms he may have.
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Childhood pals Spears and Alexander married during a 4 a.m. wedding in Las Vegas.
She later wed Kevin Federline, with whom she shares sons Sean Preston, 17, and Jayden James, 16, before divorcing the former dancer in 2007.
She’s currently married to model-turned-actor Asghari, 29, who met the singer on the set of her “Slumber Party” music video in October 2016.