The 24-year-old singer was attending a press conference in the UK about her upcoming movie Battleship.
When a reporter asked her if Ashton would be joining her in London for the promotional tour, the Barbadian star appeared miffed about the subject being brought up. “Wow, how disappointing was that question,” the starlet said before adding, “I’m happy and I’m single, if that’s what you’re really asking.”
Rihanna was linked to the Two and a Half Men actor, 34, after she was seen arriving at his Hollywood Hills home around midnight earlier this month and not leaving until around four hours later.
There had also been reports that Rihanna was set to reconcile with her ex-boyfriend Chris Brown but she also appears to have shot down that gossip.
Ashton is still currently married to Demi Moore but they separated last year amid reports he had been unfaithful to her on their six-year wedding anniversary.
Battleship, which co-stars Taylor Kitsch and Liam Neeson, hits theatres in May.