The JLS star, who is the object of Rihanna's affection, finds her "sexy as hell", reports the Sunday Mirror.
A source said that Humes has already persuaded the newly-single singer to go out on a couple of dates. "Rochelle thinks Marvin is a real charmer and is keen on him, but while she is loving the attention she is keeping him at arm’s length for the moment," the insider said.
"She's only recently single and had a tough break up – so she's not prepared to commit to a full-on relationship right now. But they text and call each other a lot. Marvin has made his feelings clear that he'd love to get together with her."
Humes recently bemoaned spending the 'cold winter nights' alone in bed, stating: "We get girls throwing themselves at us. But it's difficult to find a girl you can trust."