The Girls Aloud singer was spotted leaving the Mahiki club with DJ Crane in the early hours of Monday morning, despite reports last week that they had split.
The pair cuddled and cosied up together in the back of the limo as they drove away.
But other reports said Crane, 28, was jealous of Harding's relationship with one of her backing dancers, Jackson Williams.
Girls Aloud's heavy touring schedule meant Harding spent more time with hunky backing dancers than her man.
Crane waited home alone for Harding while she went off on the road.
Harding and Williams, 27, were pictured frolicking together in the Med alongside the rest of the group, and rode a jet ski together.
A band spokesman insisted that there was nothing going on between Harding and Williams.