Lea Michele vomited while singing 'Let It Go' on 'Glee'.

She said: "I was super nervous; the day didn't start off so well.

"I was singing, there was snow falling, I looked up, trying to make it magical and beautiful, and ended up choking on the snow and vomiting.

"And they have it in slow motion, on film. But the rest of the day was great. Some of our crew members brought their kids and I was like, 'Oh this is so great.' "

Despite admitting she felt anxious ahead of the performance, the raven-haired stunner received a confidence boost when Idina – who plays her 'Glee' character Rachel Berry's mother Shelby Corcoran in the show – sent her a good luck message on Twitter.

Speaking on 'Jimmy Kimmel Live', she added: "[It was] a lot of pressure. At first I was sort of worried because, you know, Idina sang it and Demi [Lovato] sang it, so I was like, 'So many people have done it, but I got Idina's blessing which was wonderful.'

"We were sort of tweeting each other and she knew it was happening so I felt it's her song. I mean, at the end of the day, it might be in a movie but that's her song."