Strictly Come Dancing bosses were forced to make an emergency 999 call after Amy Dowden fell ill backstage.
The 34-year-old pro dancer returned to the series full time this year after battling cancer.
But just minutes after her performance on the ballroom with JLS star JB Gill on Saturday night she is understood to have fallen ill.
A spokesman for Amy said: "Amy was feeling unwell and so an ambulance was called as a precaution. She is feeling much better and would like to thank the Strictly family for their love and concern. We request Amy's privacy in matters of health is kindly respected."
An East of England Ambulance Service spokesman said: "We were called just after 9pm on Saturday to attend a medical emergency at Elstree Studios in Borehamwood.
"An ambulance was sent to the scene. One patient, an adult female, was transported to Barnet Hospital for further care."
Earlier Amy and JB Gill glided their way to a score of 32 with their foxtrot to Dancing In The Moonlight by Toploader.
Du Beke thought it was a "super duper performance" while Revel Horwood thought Gill could have gone further with the scarecrow character.
Amy was thrilled to return to Strictly full time this series. Speaking in August, she told Prima: “Strictly has changed everything, from the opportunities it’s given me – I’ve got to do tours, travel the world, buy a house, open a dance studio – to the people it’s brought into my life... I’ve been in life-or-death situations, so dancing a one-minute-30-second routine for entertainment isn’t quite the same as walking into chemotherapy.”
The Welsh professional dancer, 33, was too ill to compete in last year's series of the BBC competition after she was diagnosed with stage three breast cancer last May and underwent a mastectomy.
After her health check in March revealed "no evidence of disease", she set her sights on getting back to the dancefloor and was given a partner in the new series to make a full comeback
Appearing on BBC Breakfast in March, Amy had said: "This is the longest I've never danced for since May so I need to get my body back into it.
"And obviously, my body's been through so much with chemo so it's building up gradually. But I have missed it so much. I used to go and support them and it was bittersweet. I was supporting my best friends but I didn't want anything more than to be on that dancefloor. It was so cruel.
"So that's the aim, is that they'll have me back, to be back on that dancefloor with my best friends doing what I love most later this year."
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