The TV beauty, who famously clashed with tattooed vixen Jemma Lucy, is currently filming the show in Italy, along with Love Island player Muggy Mike.
The Welsh starlet will also be joined by her ex Conrad Williams.
During previous stints in the villa, potty-mouth Kayleigh has shocked viewers with explicit rants and epic diva strops.
After finding Jemma in bed with her ex Ashley Cain in Series 5, the brunette gal lost it and chucked all her items in the pool.
Raging to camera, she vented: “Jemma and Ashley equals disgusting… I f***ing hate her… stupid little s**t”
She also boasted she only romped with Stephen Bear to "piss Vicky Pattison off’ as she "doesn’t like her".
A source told Daily Star Online: "Kayleigh is a regular on Ex On The Beach.
"Each time she's been on the show has been explosive, so it's not hard to see why she was asked again.
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"Producers were keen to get big names to sign up, but it hasn't been easy.
"Stephen Bear was also approached to take part, but he declined.
"Kayleigh's ex Conrad Williams agreed to go on the show though."
Despite the series being billed as having an All Star line-up, many big names from previous series aren't involved.
Rogan O'Connor, Joss Mooney, Chanelle McCleary, Jemma Lucy and Sean Pratt are all not returning to the explosive villa.
Over the past few series, Ex On The Beach has seen ratings fall.
While the show was once one of the biggest programmes on TV, it seems viewers are growing tired of repetitive storylines and uninspiring cast line-ups.
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A spokeswoman for Stephen Bear said: "Stephen has had many offers for TV work over the last few months and his schedule is packed.
"Some work has had to be turned down, but simply because his diary is full."
A rep for Kayleigh Morris has been contacted by Daily Star Online for comment.