Becky Mantin caused a stir as she filled in for the pregnant presenter on the ITV show, with many at home taking to Twitter to praise the new arrival.
The 36-year-old, who regularly fronts the forecasts for the broadcaster, pulled out all the stops in a saucy navy look for her first appearance.
Wearing her short blonde tresses down, the mother-of-three flashed plenty of cleavage in her plunging dress, which featured short sleeves and scallop detailing.
The number also made the most of her shapely pins thanks to a daring hemline, which she wore with a chunky bronze necklace.
Becky gave a cheeky wink to fans as she rounded up her segment, after tweeting about her “painful” wake-up time.
As well as plenty of heart emojis from those watching online, one user tweeted: “@GMB What a fantastic weather girl, I would love to see her every day #realweathergirl.”
Another agreed: “@BeckyMantin_ how lovely to see your cheerful, smiley face this morning on @GMB weather.”
“Thank you @BeckyMantin_ fiancé went to work with an extra spring in his step… welcome to GMB,” a third tweet stated.
However, one person didn’t seem convinced: “That dress is too short and who she winking at? #GMB”
Becky had previously told her 12,000 followers: “Already this is painful! Join me for @GMB #Weather tomorrow VERY EARLY! #howdotheydoit.”
Good Morning Britain airs weekdays from 6am on ITV.
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