Taylor Swift appeared to be struggling to cope with the extreme heat when she performed in Brazil last week.
The multi-award winning singer is currently on the South American leg of her sold-out Eras Tour - but was met with temperatures of up to 38C while performing in Rio de Janeiro.
At one point, a clearly concerned Swift instructed venue staff to hand out water to fans.
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In a clip shared online, Swift says: "There's people that need water right here, maybe 30, 35, 40 feet back.
"So whoever is in charge of giving them that, just make sure that happens. Can I get a signal that you know where they are?"
While another video, filmed by a fan and shared online, shows the 33-year-old appearing to struggle as she takes a moment to catch her breath between songs.
The footage shows Swift looking upwards as she gulps down air before getting back to her performance.
The concerning clip was shared just hours after it was announced 23-year-old fan Ana Clara Benevides Machado had died ahead of the show.
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Swift confirmed the tragic news on her Instagram Stories, where she wrote: "I can't believe I'm writing these words but it is with shattered heart that I say we lost a fan earlier tonight before my show.
"I can't even tell you how devastated I am by this.
"There's very little information I have, other than the fact that she was so incredibly beautiful and far too young.
"I'm not going to be able to speak about this from stage because I feel overwhelmed by grief when I even try to talk about it.
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"I want to say now I feel this loss deeply and my broken heart goes out to her family and friends.
"This is the last thing I ever thought would happen when we decided to bring this tour to Brazil."
According to Brazilian newspaper Fohla De Sao Paolo, Machado fainted at the stadium and later died.
The cause of death has not yet been announced.
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On Saturday (18 November), Swift decided to postpone that evening’s performance due to the ‘extreme temperatures in Rio’.
In a post on Instagram, she said: "I’m writing this from my dressing room in the stadium.
"The decision has been made to postpone tonight’s show due to the extreme temperatures in Rio.
"The safety and well-being of my fans, fellow performers, and crew has to and always will come first."
Topics: Music, World News, Taylor Swift
Claire Reid