The 47-year-old actress – who plays Megan Macey on the hit ITV soap – let loose during a Joel Dommett stand up show at Leeds Festival.
An onlooker told The Sun Online: "Gaynor was having the time of her life at the festival!
"She was running around and dancing like she was completely lost in the music.
"She was egged on to try crowd surfing and absolutely loved it. Who knew she'd be so game for having a laugh?"
As well as her role on Emmerdale, Gaynor also starred in Coronation Street, playing a character called Judy Mallett.
In a recent interview with the Daily Mirror, Gaynor – who has two children with her long-term partner Mark Pickering – revealed that she's starting to become more of a party girl now that she's in her forties.
And these pictures back up her claims!
She said: "I have teenagers now so I can feel this independence returning. Party-girl Gaynor is creeping back in.
"I'm always the last to leave awards that aren’t televised, let’s just say that!
"I don’t party much, but the other day I had friends over and we were doing the Time Warp in my living room at 3am so it can happen.
"But I’m most likely to be found cooking for friends round at my house.
"I’ve always been a foodie, and Yorkshire has some of the best dishes around, that’s why when Lorraine asked me to join their cookery team I said yes.
"I only like to do things that are genuine to me and I love cooking."
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