The former Pussycat Doll, who was romantically linked to professional surfer Koby Abberton during a trip to Australia last year, was spotted on a night out in Melbourne with sports star Gibson last Sunday evening.
A friend of Roberts told The Daily Telegraph: "Ashley really likes Josh and is interested in him and this was the third time they've caught up in a year. They get on so well and they were looking intimate within minutes of seeing each other.
"She had her arm around him when he was whispering to her and then she stroked his ear when she whispered back. They really dig each other's company. There's plenty of chemistry there."