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In documents obtained by the news site, The Late Late Show host's legal team claim the 30-year-old woman has been harassing him and his family for months.
The woman has allegedly turned up at his house in Los Angeles on numerous occasions, including a stretch of six days this summer, which only ended when police arrived.
She reportedly told police that she and the 43-year-old had plans to marry her in Las Vegas, and his actual wife of 12 years, Julia, had 'stolen' him from her.
The woman is also accused of turning up to the studio where he makes his late night show.
Her behaviour has apparently prompted Corden to fear for the safety of his wife and three children, and the new temporary restraining order will forbid her from being within 100 yards of Corden or his family, according to TMZ.
She is also prohibited from trying to contact him in any way.
Corden's reps told LADbible they had no comment.
Corden and a number of his Cinderella co-stars were recently roasted online after they staged a flash mob publicity stunt in LA.
The Gavin and Stacey star, alongside cast members of the forthcoming musical film such as Camilla Cabello, Billy Porter, and Idina Menzel, decided to make a public nuisance of themselves by dancing in clearly shop-bought costumes to Jennifer Lopez's 'Let's Get Loud'.
Anyway, Los Angeles is widely known for having terrible traffic at the best of times, but usually the problem isn't having a variety of celebrities clogging up the roads.
If they wanted to use this stunt as a piece of viral marketing for their forthcoming film, they did a decent job of it, but only against the old maxim that any publicity is good publicity.
One person wrote: "You know how in LA you're not supposed to bother celebrities while they're going about their day? The opposite should also apply."
Another said: "Yeah sorry I'm late boss, James Corden jumped in front of my car and started humping the air in a rat suit for five minutes, it was a whole thing."
In a similar vein, someone else said: "So we just stop traffic to promote movies now?
"Yeah sorry I'm late. the lady from Wicked and a bunch of jobbers were holding up traffic to raise awareness for the new big Disney [it's not Disney, it's made by Amazon] movie."
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