Britney Spears’ ex Jason Alexander has gatecrashed her wedding hours before she is due to walk down the aisle in a bizarre move livestreamed to his Instagram account.

TMZ has reported police were called to Spears’ home, where the wedding is set to be held, after Alexander showed up telling event security Spears had invited him and that she was his “first and only wife”.

Spears married Alexander in Las Vegas in January 2004, but called it quits just 55 hours later.

Ben O'Shea, Geof Parry and The West Live producer Kate Ryan discuss.

See omnystudio.com/listener for privacy information.