The Australian X Factor judge, who used to be married to Silverchair lead singer Daniel Johns, was first linked to Sydney millionaire Hemmes when they were spotted leaving his club the Ivy together to dine at Italian restaurant Uccello recently.
An insider at the Ivy told The Daily Telegraph: "Justin and Natalie are rather a good match," while Hemmes admitted that he is "flattered" by the rumours surrounding them.
The couple reportedly ate together at Surry Hills restaurant Toko earlier this week, with onlookers saying that they saw the pair kissing and cuddling.
