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The pair were seen together at the Cheerios Childline Concert in Dublin, The Mirror reports.
A friend said: "Noirin is invited to all the showbiz parties in London nowadays so she would know JLS and the other stars who were in town for the Childline gig.
"She's been seeing a new guy who's based in London for the past few weeks and she's really glowing with happiness.
"She doesn't want it getting into the press as he's quite high-profile but she's hoping this one could be her Mister Right," they added.
The 'Beat Again' star recently declared his love for X Factor contestant Stacey Solomon.
