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The 37-year-old brunette vixen joined Susanna Reid and Richard Madeley on the show to bring audiences all the latest updates on the upcoming forecast.
And despite Lucy revealing there would be shower spells and even snow up in Scotland, fans couldn’t get enough.
Lucy – who joined the ITV breakfast show last year – was dressed in a minuscule denim dress cut just above the knee.
Susanna told her: “You are brightening up everyones morning with your dress, which viewers are loving.
“They’re loving the denim. Dolly Parton denim.”
Lucy confessed: “It is a bit Dolly Parton, I’m a bit worried that it might shrink in the rain, which wasn’t the brightest move with the weather today.”
“Better not go out today then Lucy,” joked Susanna.
“The dress is a bit Dolly Parton, I’m a bit worried that it might shrink in the rain”
Richard then remarked: “I think you should just pop out at once and just test it out.”
An awkward Lucy replied: “Thanks for that Richard…”
She later addressed her outfit: “I was hoping it was a timeless classic.”
Audiences flooded Twitter with compliments on Lucy’s jaw-dropping look.
One person wooed: “Lucy looks amazing! The weather has just improved by 100%.”
“The weather lady on GMB is gorgeous,” added another.
Lucy kicked off her telly career on Sky News for five years from 2005.
She went on to join 5 News, Daybreak, ITV Weather and ITV Racing.
Good Morning Britain weekdays at 6am on ITV.