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Is this the moment Rihanna fell for Colin’s Irish charm?

WAS this the moment that pop superstar Rihanna fell for our very own Colin Farrell?

The high-profile pair, who are rumoured to have enjoyed a string of secret dates, first met on the Graham Norton Show before Christmas.

Viewers remarked how the chemistry between the pair sizzled.

"She's really smitten by his charisma, his old-fashioned manners and sexy Irish accent," a friend of the singer said.

It is understood that the stunning Barbadian (23) was delighted with Colin's tepid chat-up line -- an offer to take her for a cup of tea after the show.

Rihanna's pal revealed: "She was in hysterics! It was the sexiest, most heart-meltingly sweet thing a guy's ever asked her to do. Especially when Colin, who's working hard on his sobriety, explained he couldn't go to a bar. They went back to her hotel and talked late into the night."

The source revealed how, before leaving, Colin (34) handed Rihanna a note which read: "Call me: I won't stop thinking about you until you do."

While the couple have remained silent on their relationship, they have reportedly spent a lot of time together in the States in recent weeks. The actor is even said to have invited the SOS star to Castleknock to meet his family.

Colin split from Alicja Bachleda-Curus, with whom he has a 16-month-old son Henry, last year, while Rihanna also broke up with her former beau, baseball star Matt Kemp, before Christmas.