United Kingdom, March 2 -- Ariana Grande worked with an acting and vocal coach months before her first audition for 'Wicked'.

The 31-year-old singer stars as Glinda The Good Witch in the two-part adaptation of the Broadway classic - the first film of which was an international blockbuster - and she has explained how she wanted "every tool in my box sharpened and ready" before she tried out for anything.

She told Australia's WHO magazine: "Well, I worked with my acting coach, Nancy Banks, who is absolutely brilliant. And that work we were doing started even long before my first audition because I just wanted to be prepared no matter what was going to be asked of me.

"I wanted to have every tool in my box sharpened and ready. And it just...