An American student has claimed that Rex cheated on his girlfriend Nicole with her during a trip to Miami, Florida.
Ashley Abbott alleged she and Rex had a romance after meeting on a street in the city.
The 21-year-old old told The Sun that they spent nights together in a posh hotel, adding that Rex had offered her a job at his family's restaurant in Notting Hill.
The student said Rex claimed he was single, despite having dated Nicole Cammack for the past few years.
Ashley said Rex stopped contacting her shortly before entering the house. "I hope he seeks professional help for his deceitful, womanising behaviour. He has no conscience," she said.
A nightclub dancer earlier claimed that Rex had cheated with her earlier this year.