Make-up free Madonna, 57, sports wet hair as she dashes to last-minute rehearsals for opening night of Rebel Heart tour

She is about to open her new world tour.

And, clearly, Madonna doesn't have a minute to spare - as she proved when she stepped out from rehearsals with wet hair on Tuesday morning. 

The 57 year-old was seen make-up free and with wet hair as she headed out to Montreal's Bell Center for a final run-through.

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No time for hair and make-up: Madonna was seen make-up free and with wet hair as she headed out to Montreal's Bell Center for a final run-through on Tuesday morning 

No time for hair and make-up: Madonna was seen make-up free and with wet hair as she headed out to Montreal's Bell Center for a final run-through on Tuesday morning 

Wearing a black and white T-shirt with some chinos and a cardigan tied around her waist, she was clearly dressed for function, rather than fashion. 

Adding a hat, sandals and sunglasses to the mix, she kept it simple while adhering to such a hectic schedule.

The latest sighting of the star comes just 24 hours before she finally starts her Rebel Heart Tour, which will delight music fans for two nights at the Canadian venue and include a guest spot by Diplo.

Casual: Wearing a black and white T-shirt with some chinos and a cardigan tied around her waist, she was clearly dressed for function, rather than fashion

Casual: Wearing a black and white T-shirt with some chinos and a cardigan tied around her waist, she was clearly dressed for function, rather than fashion

But he won't be the only other celebrity taking part in forthcoming dates. Earlier this summer she surprised fans by revealing that comedienne Amy Schumer will open her shows in NYC.

The star will crack jokes before Madge's concerts September 16-17 at Madison Square Garden, and September 19 at Brooklyn's Barclays Center. 

Madonna - last name Ciccone - has only announced Diplo as another opening acts for her 54-date all-arena tour.

On the road: Kicking off in Montreal, the Material Girl will perform across North America for two months before many major capitals across Europe, including London, Paris, Prague and Berlin

On the road: Kicking off in Montreal, the Material Girl will perform across North America for two months before many major capitals across Europe, including London, Paris, Prague and Berlin

Longevity: Approaching 60 years of age, Madonna has been a musical headliner since the early 1980s when she released her first hit Everybody

Longevity: Approaching 60 years of age, Madonna has been a musical headliner since the early 1980s when she released her first hit Everybody

Kicking off in Montreal, the Material Girl will perform across North America for two months before many major capitals across Europe, including London, Paris, Prague and Berlin.

Approaching 60 years of age, Madonna has been a musical headliner since the early 1980s when she released her first hit Everybody.

Her first self-titled album was released in 1983, selling more than five million copies, followed a year later by Like a Virgin which has sold more than 10 million copies in the three decades since. 

Dressing to impress: Madonna, seen here performing at the BRIT Awards,  will no doubt flash some flesh

Dressing to impress: Madonna, seen here performing at the BRIT Awards,  will no doubt flash some flesh

Mwah! Madonna and Britney Spears trade on their sexuality by kissing onstage during the 2003 MTV Video Music Awards  in New York City, 2003

Mwah! Madonna and Britney Spears trade on their sexuality by kissing onstage during the 2003 MTV Video Music Awards in New York City, 2003

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