Amanda Holden wore the colourful sundress to celebrate the opening of Stanmore College’s new performing arts block.
The Britain’s Got Talent star, 47, looked incredible in the low-cut frock, which peeped open at the top to tease her assets.
Amanda’s outfit also had ruffles along the hemline that drew attention to the asymmetrical garment and highlighted her figure.
Completing the look, the mother-of-two wore ruby red lipstick and had perfectly manicured nails that matched the colour of her pout.
Her blonde tresses were styled in loose waves, which she wore in a middle parting and let drape across her shoulders.
Posing in front of a sea of flowers and plants, Amanda placed one hand on her waist as she smiled for the camera.
In another photo, Amanda could be seen cutting the ribbon for the new school building with a large pair of scissors.
She almost risked a wardrobe malfunction while doing the honours and only just saved herself from embarrassment by placing a hand across her chest.
Amanda shared her delight at opening the new school department, telling her Instagram followers: “Honoured to have opened my old school @swanmorecollege new #performingarts block. So much #talent!”
Last month, Amanda revealed saucy details about her love life with husband Chris Hughes and told the Daily Star he puts her on the “naughty step”.
She said: “Much to my husband’s dismay, I confess something to a newspaper or something or other every week by accident or on Twitter.
“I have no more secrets because of social media and life in general. I wear my heart on my sleeve.
“Obviously there are personal things which I would not broadcast. But I regret saying things every week – and Chris puts me on the naughty step.
“He says, ‘I can’t believe you would say that Mandy’.”
However, this is not the first time Amanda had discussed the couple’s sex life as she once let slip that they get intimate on the sofa whilst watching box sets.
The outspoken presenter also told ITV’s Lorraine viewers that she has a “magic box” of sex toys.
Later Amanda claimed her openness runs in her family and said she can’t help her “big gob”.
She explained: “My mum is very similar… and my gran. We are very gobby.”
Amanda is currently appearing on the 12th series of Britain’s Got Talent alongside fellow judges Simon Cowell, David Walliams and Alesha Dixon.
Britain’s Got Talent continues Saturday on ITV at 8pm.