The Swedish duo has been performing with the singer on the European leg of her Bangerz world tour and they have spoken out to dismiss gossip about wild parties on the road.
They insist the Disney star-turned-wild child is a true professional and would never jeopardise her tour by misbehaving.
Icona Pop member Aino Jawo tells Britain's Daily Mirror, "Miley is such an amazing performer. She sings amazingly every night. She would never go out and party before her gigs. She's one of the hardest-working artists out there. She soundchecks every day and she's so humble."
Cyrus recently called off the remainder of her U.S. tour after suffering a nasty allergic reaction to medication she was prescribed for a sinus infection. She subsequently spoke out to dismiss rumours she had suffered a secret drug overdose, saying, "I didn't have a drug overdose. I took some s**tty antibiotic my doctor gave me and I had an allergic reaction."