The 24-year-old singer was spotted arriving at Ashton Kutcher's property around midnight and was seen leaving at 4 in the morning.

TMZ reports that Riri was seen with her security team at Kutcher's bachelor pad in Los Angeles and was seen leaving during the wee hours. Both single, the two have sparked rumors that there might be something going on that the public wasn't aware about.

Newly single Ashton Kutcher seem to have bounced back from his failed relationship from Demi Moore after he was linked with screenwriter Lorene Scafaria. The two have been spotted on more than one occasion. They are rumored to be quietly dating since Christmas of last year.

Rihanna made controversies when she collaborated with ex-boyfriend Chris Brown for two tracks. Ever since her messy breakup with Chris Brown after he attacked her three years ago, the Barbadian singer has been in and out of relationships.

And just last week, Rihanna sparked up rumors when she dropped a visit to Ashton's pad at a very unlikely hour. Due to their public image, stirring some headlines is inevitable.

Meanwhile, the Two and a Half Men star is said to become the 500th space traveler to take voyage on Virgin Galactic. Although it isn't confirmed yet, Ashton did tweet about what Virgin's CEO Sir Richard Branson announced via his blog.

"I gave Ashton a quick call to congratulate and welcome him. He is as thrilled as we are at the prospect of being among the first to cross the final frontier (and back!) with us and to experience the magic of space for himself," Branson said.

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