Photo Credit: Getty Images; WireImage
A source told Us Weekly that the 24-year-old Grammy winner visited Kutcher's bachelor pad just before midnight on March 20 and "then stayed for three hours." But a different insider promises that "they're not hooking up."
As for the Barbados-born beauty herself, she confronted the romantic speculation while promoting her upcoming summer action flick, Battleship.
"Things are clearly going brilliantly in your career. I just wondered if you are as happy in your private life," one reporter asked RiRi at the movie's London press conference March 28. "Will we be seeing a certain Mr. Kutcher perhaps making a trip over here?"
The Battleship star, whose famous exes include fellow hip-hop star Chris Brown and baseball player Matt Kemp, responded with an eye roll.
"Wow. How disappointing was that question? I'm happy and I'm single, if that's what you were really asking," she said. Ouch!
Considering that Kutcher has been attached in the rumor mill to friend Lorene Scarfaria and spotted hanging out with models in Brazil, it's no surprise that a source confirms to Us Weekly that the actor has plenty of options when it comes to romance.
"There's no shortage of girls around him," the insider tells Us of the Two And a Half Men star. "Ashton's definitely enjoying the single life again."