The secret to how Adele sneaks on stage during her sold-out Australian concerts.

It’s the biggest mystery surrounding Adele’s sold out Australian tour.

How does the British megastar sneak on stage in the middle of the stadium each night, given that she’s in a sports stadium with no underground access to the stage?

Well it turns out the Hello singer spends a couple of minutes each night ‘drenched in sweat’ while being wheeled through the crowd to the stage in a small black box.

The 28-year-old chart topper is wheeled past thousands of unsuspecting fans at every concert, before she makes her grand entrance on stage.

She is flanked by her security team and has an iPad on board to keep herself entertained.

The Grammy Award winner has hinted at the her peculiar mode of transport to fans, laughing as she said: "How I get to this stage makes me so sweaty, I'm drenched".

“I can’t tell you til the end — you’ll laugh when you find out.”

A source explained to The Sun: “Adele sits in the box for several minutes as she is taken from her dressing room right to the centre of the crowd."

“Most of her fans are already seated and just assume it’s a piece of kit they are moving but some have been told by staff at venues that it’s actually their idol and a woman worth $137 million sitting in a pretty small box a few feet from them.”

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“A few have worked it out as her personal security Peter Van Der Deer — who is never away from her side — accompanies the box during its journey."

“Then her team flank it as it reaches the stage and shield her from view as she climbs out and goes to wait underneath the stage for the start."

Adele is finishing up her Australian tour with gigs in Melbourne and Adelaide this week.