Maria Tutaia's allegiance to be tested as All Blacks take on Australia

Maria Tutaia watches her boyfriend Israel Folau during tonight's Rugby Championship opening game between the All Blacks and the Wallabies in Sydney. Photo / Brett Phibbs

She's a Kiwi sporting hero - but has Maria Tutaia turned traitor?

Loyalties are set to be tested during tonight's Bledisloe Cup match, with Wallaby star Israel Folau attempting to convert girlfriend Silver Fern Maria Tutaia to supporting his team.

"She's hard work, she's pretty loyal," Folau told the Daily Telegraph.

Maria Tutaia will be supporting her boyfriend, Wallaby star Israel Folau tonight. Photo / Instagram

"She supports them, but she supports me."

Tutaia is among a growing group of glamorous Australian rugby wives and girlfriends. The newest member of the club is singer Delta Goodrem.

She has been dating winger Drew Mitchell for a few months but haven't spoken publicly about the relationship.

The Daily Telegraph reports that Mitchell's Wallaby teammates have reacted to the budding romance by playing Goodrem's songs over loudspeakers during training this week as the team prepares to take on the All Blacks tonight.

Delta Goodrem has been dating wing Drew Mitchell for a few months but haven't spoken publicly about the relationship. Photo / Martin Sykes

Other stunning partners of Wallabies include Matt Giteau's wife Bianca, a former netball star and the sister of AFL player Lance Franklin, and Quade Cooper's model girlfriend and former Miss Universe Australia Laura Dundovic.