Ariana Grande's new song 'Problem' has shot straight to the top of the US iTunes chart.

The singer unleashed the Iggy Azalea collaboration today (April 28) and it is performing well in her home country.

Grande later tweeted: "Number 1 already. Loves you never fail to amaze me.....so grateful. I hope you enjoy problem."

The starlet also performed the song live at the Radio Disney Music Awards on Saturday (April 26).

The song is the first track to be taken from Grande's upcoming second album.

She released her debut effort 'Yours Truly' in 2013, which spawned singles such as 'The Way' and 'Baby I'.