Hardwick, who has been dating The Wanted singer for the past three years, isn't a fan of the boy band's headline-grabbing behaviour, including throwing a drink on a passer-by from a hotel balcony last month, reported Daily Mirror.
"It's stupid, but they obviously think they're rock 'n' roll doing it. They're young and having fun," she said.
The 24-year-old beauty was also mortified to discover her boyfriend was wanted by the police in the US for defecating in a bag and throwing it onto the highway.
Hardwick made several appearances on the 'Glad You Came' hitmakers' reality show, 'The Wanted Life', and says living with the five boys - Tom, Max George, Siva Kaneswaran, Nathan Sykes and Jay McGuiness - during their stay in the US was tough because they are so dirty.