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24 March 2012, 09:12
The 'We Found Love' singer is rumoured to have been in a secret relationship with the comedian for eight weeks.
Rihanna is rumoured to be dating Hollywood actor Ashton Kutcher.
The 'You Da One' star has apparently been seeing the Two And A Half Men star for the past two months on numerous secret dates.
A source told The Sun: "The flirting began as soon as Rihanna and Ashton met and swapped numbers. That moved on to texts and arranging to meet. They snuck off to a Santa Monica hotel a few weeks ago.
"They are two single people having a fling, so thought it would be best to meet in secret. Rihanna has told friends he's funny and cute. Both of them love a good time and think they're too busy for anything serious just yet. She's starting to enquire about Kabbalah sessions with his rabbi."
The comedian has been single since he announced plans to divorce Demi Moore at the end of last year and the source added that he and RiRi are keeping their relationship quiet in order to not flaunt it in the face of his ex.
"Ashton does not want to rub a new relationship in her face. She's still vulnerable. He's a good guy and, with all Demi's recent health problems, people have forgotten that."
Reports of the couple dating began after the Bajan star was apparently seen arriving at the star's Hollywood mansion at midnight earlier this week and not leaving until around 4am.
Meanwhile, it is less then a month since Rihanna spoke out on being single during her chat on The Jonathan Ross Show admitting she missed being in a relationship.