Rihanna raised a lot of eyebrows last week after she was spotted leaving Ashton Kutcher‘s L.A. mansion after arriving there at midnight. But apparently that’s not the first time they’ve spent time together.

PHOTOS: Rihanna Spotted Leaving Ashton Kutcher’s House at 4 AM?

According to new reports from London tabloid The Sun, Rihanna and Ashton Kutcher have been seeing each other since last December.

The 24-year-old singer hit if off with Two and a Half Men hunk Ashton at a mutual pal’s house party in Los Angeles last December.

The Umbrella singer is so besotted with Ashton, 34, that she has asked about joining his Kabbalah group.

Rihanna and Ashton, who subscribes to the mystical religion, have been meeting up for a series of late-night trysts after the singer returned to LA to record her latest album.

One source said: “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.”

Ashton Kutcher has been “single” since last November when his wife, actress Demi Moore, filed for divorce from him following reports that the actor had cheated on her with party girl Sara Leal on their sixth month wedding anniversary.

With the exception of a few rumored flings here and there with guys like Drake and Colin Farrell, and a public relationship with baseball player Matt Kemp, Rihanna has pretty much remained single since splitting with Chris Brown back in 2009.

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