Braless Amanda Holden wows in a ruched white midi dress as she leaves the Heart FM studio

Amanda Holden went braless in a white midi dress as she left the Heart FM studio after her radio show on Thursday.

The 51-year-old presenter looked sensational in the fitted number that showed off her sensational figure.

With gold buttons and a polo collar, she teamed the sophisticated Michael Kors number with a long black coat.

Amanda increased her height with a pair of gold and white stilettos and accessorized with a leather shoulder bag.

She styled her blond hair in loose curls and shaded her eyes with stylish, oversized sunglasses.

Elegant: The presenter looked sensational in the fitted number that showed off her sensational figure

Amanda was closely followed by her co-star Ashley Roberts, 41, who opted for a warm turtleneck.

She slipped on a matching midi skirt underneath and elevated her body with a pair of slouchy heeled boots.

Ashley finished off her colour-blocked look with a wool coat, which fell loosely to her shoulders and carried a small Jacquemus clutch.

The radio host pushed her blonde locks out of her face in a high bun and covered her eyes with sunglasses.

Celebrities and their families went all out for World Book Day on Thursday.

And while kids traditionally celebrate the day at school, Amanda couldn’t resist the chance to dress up during her radio show.

The TV personality even got her co-hosts Jamie Theakston and Ashley involved, as the trio dressed up as the characters from L. Frank Baum’s famous children’s novel The Wizard of Oz.

Amanda put on a leggy display in a blue gingham apron and donned the iconic red heels as she transformed into Dorothy Gale.

Sophisticated: Amanda increased her height with a pair of gold and white stilettos and accessorized with a leather shoulder bag

Laid back: Amanda was closely followed by her co-star Ashley Roberts, 41, who opted for a warm turtleneck

Stunning: Pussycat doll elevated her body in a pair of slouchy heeled boots

She styled her golden locks in pigtails and went for a glam makeup look as she posed with a woven basket.

Getting in on the act, Jamie dressed as The Tin Man and showbiz reporter Ashley looked unrecognizable as The Cowardly Lion as she posed in the Heart FM studio.

Ashley showed off her incredible figure in a skin-tight brown catsuit, while adding to her height with a pair of heels.

Sharing a playful snap with her Instagram followers, Amanda wrote: “I have a feeling we’re not in Kansas anymore.”

Character: Ashley, Amanda and co-host Jamie Theakston dressed up as characters from the famous children’s novel The Wizard of Oz by L. Frank Baum for World Book Day.