Iggy Azalea's biggest fear is being sick on stage.

The 'Fancy' hitmaker said she's come up with a plan in case she feels like she needs to be sick whilst she's performing.

She exclusively told BANG Showbiz: ''It's my actual nightmare to vomit on stage. If I ever vomited on stage, I would probably kill myself.

''I think if I start to feel like that, I have two plans, I would have already figured out my emergency exits. So if I can make it off stage, I will go off stage and vomit.

''If I feel like I can't make the wings, my poor DJ will hate me for it but I'll just run behind the DJ booth and vomit on his shoes. Poor DJ, but you don't want pictures.''

Iggy - who toured with Beyoncé when she brought her 'Mrs. Carter World Tour' to Australia - said that was the only time she's felt sick with nerves on stage.

The 23-year-old singer said: ''There was one time I felt sick on stage and that was when I was on tour with Beyoncé but that was because two hours before, I got my wisdom teeth pulled out. I was put to sleep for it so I was really not up for that.

''I had taken loads of painkillers and I just felt already so woozy from just waking up from having them pulled out ... It turned out I ended up doing the whole tour like that because I got them pulled out before the second performance.''

Iggy releases her new album 'The New Classic' on April 21 and her current single 'Fancy' is available to download now.