Prior to posting the picture she took to her Instagram stories to show off the snow-white blazer dress.
“I am wearing this lovely coat dress from Karen Millen,” she told her two million followers.
“I really love the sort of extra lapels that you can tuck under there,” she continued as she twirled around.
Showing the back of the dress she revealed: “There’s a cheeky little cut out around the back which is lovely.”
Recommending that fans who intended to purchase the dress go down a size, she revealed why she was wearing it.
“I just think it’s a really cool dress. I’ve got a business meeting today, but I feel sassy enough, but it’s not sort of too formal,” she explained.
“I also think you could go to dinner or a lunch in it or a wedding or a christening,” she gushed.
She was so excited that she stumbled over her words as she told her followers to “have a fabulous day”.
The dress doesn’t appear to be currently available on the Karen Millen website which implies that lucky Amanda nabbed a pre-release item.
However, there are other dresses in a similar style available and many are currently on sale with up to 30 percent off Occasionwear.
Earlier Amanda had posed in the dress with her Heart co-host as they celebrated the news that they have 11.3 million listeners daily.
Describing the news as “incredible” she wrote: “Thank you for being part of our Heart Breakfast family.”
This is the second time in a week that Amanda has flashed her enviable pins on the social media site.
On Saturday she put on a very leggy display in a red satin mini dress as she posed for a series of sultry photographs during a lavish trip to Paris.
Her fans were floored by the glamorous snaps and hundreds took to the comments to compliment her age-defying appearance including Loose Women’s Ruth Langsford who exclaimed: “Ooh La La! Enjoy.”