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Coyle, who has had an on-off relationship with Desperate Housewives actor Jesse Metcalfe since 2006, has found a new partner, according to The Mirror.
Karitzsis is a professional dancer who has performed with Kylie Minogue and starred in the Living reality show Dirty Dancing: The Time Of Your Life.
"Nadine has known Jamie for about a year now," said a source. "They dated for a couple of months last year during one of her splits with Jesse but work commitments put paid to their romance.
"They have stayed in touch and met up recently, although they hadn't seen each other for ages. Nadine really liked him and they've been on a few dates over the last couple of weeks.
"She wants to keeps things out of the public eye and take it slowly. She and Jamie have been friends which is a good thing. He's been there for her."
