Amanda Holden is known for her daring fashions, and she certainly proved that on Thursday when she posted a bold look, as she resembled a classic Bond girl.WOW: Amanda Holden's lifelike £5k playhouse for daughters will blow your mindThe Heart Radio presenter posed entirely naked, covering herself with just a shag blanket and a diamond necklace as she revealed that she was preparing for an amazing announcement involving her radio show. In her caption, she explained: "So proud to be involved in the biggest day of the year for @thisisheart with the biggest prize on UK radio."WATCH: Relive Amanda Holden's best bikini and swimsuit momentsShe then joked: "To celebrate I'm wearing over 1000 diamonds worth £1m!!! There was a security guard hovering and they left with the ring & necklace within 10 minutes of this picture.PHOTOS: BGT judges Simon Cowell, Amanda Holden & more have the most epic homes – insideSEE: Amanda Holden poses up a storm in gorgeous mini-dress"I've loved the past 15 weeks seeing hundreds of Heart listeners winning tons of cash prizes during #HeartMakeMeAMillionnaire."Tomorrow - Friday 27th May - one very lucky listener will become a MILLIONAIRE live on air!"And for any fans who may have been concerned about the material that she was wearing, Amanda then revealed: "Please join us from 6:30am.