The musician and the former Pussycat Dolls star were first linked in June (14), but Fletcher dismissed the reports.
However, he has now opened up about their romance, telling Britain's Daily Mirror newspaper, "Ashley and I are great - I'm loving it at the moment. It doesn't feel like we're in the spotlight and we see each other when we can.
"We are both really busy so we make the most of the time we get together... we've not had the serious conversation yet."
Roberts recently confirmed she is dating a new man but would not reveal the identity of her beau.