"Usually when Benji's in NYC, he will stay at the Bowery Hotel. But since he's been with Cameron, he's been staying at her place! They're moving really fast!"

The actress and singer seem very comfortable with each other already, according to the insider, as if they've been together forever!  "They seemed very relaxed and were walking around the neighborhood like it was their home ... just very low-key. He seems right at home with her."