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Did Rihanna find love in a hopeless place with Ashton Kutcher?

Not so, according to the 24-year-old pop star. Though an insider tells the new issue of Us Weekly (out Friday) that Rihanna arrived just before midnight at Kutcher's Hollywood pad on March 20 -- "and then stayed for three hours" -- another source promises "they're not hooking up."

Rihanna confronted the romance rumors head on during a press conference for Battleship in London Wednesday.

"Things are clearly going brilliantly in your career. I just wondered if you are as happy in your private life," one reporter asked the Grammy winner, whose exes include singer Chris Brown and baseball player Matt Kemp. "Will we be seeing a certain Mr. Kutcher perhaps making a trip over here?"

Rolling her eyes, Rihanna responded: "Wow. How disappointing was that question? I'm happy and I'm single, if that's what you were really asking."

Indeed, another insider points out that Kutcher, 34, has plenty of options. "There's no shortage of girls around him," the insider tells Us of Demi Moore's ex-hubby. "Ashton's definitely enjoying the single life again."