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To many she's known as Queen Elsa in Disney's Frozen or the original Elphaba in musical Wicked – John Travolta knows her as "Adele Dazeem".

But to Idina Menzel's 5-year-old son Walker, who she shares with actor ex Taye Diggs, she's just "mummy" and anything else to him is an "inconvenience".

"He doesn't like to hear me singing," the 43-year-old celebrated Broadway star told a gobsmacked audience as she played London's Wembley Arena last night as part of her headlining world tour.

"He says it makes him sad, I guess he's a sensitive cat."

"He'd rather have my attention, my job is an inconvenience," she added as she weaved her way through a number of musical standards, surprises such as Radio Head's Creep and The Police's Roxanne, plus, you guessed it, her Oscar winning anthem Let It Go.

Bad news for Walker however, he's about to get a whole lot more inconvenienced as the House of Mouse have greenlit Frozen 2.