Published in The Daily Telegraph, the Confidential columnist said Armytage underwent a โtransformationโ to appear on the high-rating breakfast program.
โConfidential today casts an eye over Armytage at her casual best running errands โ an entirely different image to the one seen when the television cameras are rolling, the stylists are styling and the directors are directing,โ Sharp wrote.
The story ran alongside a series of unflattering paparazzi images of Armytage โ many of which were several years old.
Armytage, 37, said the article was โcowardly and meanโ on Sunrise on Friday morning.
โI donโt understand this shaming. I donโt know whether itโs trying to bully me into an eating disorder,โ she said.
โThe story is an excuse to cast an eye over my style when Iโm not at work. Theyโve pulled together paparazzi photographs taken many years ago.
โMaybe it is to shame me for being a size 12. But I donโt understand why newspapers need to dredge up old pictures which have absolutely no news value on such a big news day,โ Armytage added.

Sam in the The Weeklyโs September issue.
She also took to Twitter to address what she believed was a personal attack on her appearance.
โWow. A newspaper bullying a woman about her weight โ I thought those days were gone!โ
Model Jesinta Campbell tweeted that women should be supporting each other.
โThis makes me so sad Sam! In a day where we should be lifting women up and focusing on more than what a woman is wearing this really is a backward step,โ she said.
Editor of Harperโs Bazaar, Kellie Hush said it was โbullying at its tabloid worstโ.
โShame @dailytelegraph. @sam_armytage has been a target for months. Where is the sisterhood @InSharpRelief?โ she tweeted.
Editor of Marie Claire, Jackie Frank told The Australianโs media editor Sharri Markson that the article was sexist.
โItโs outrageous, itโs disgusting, itโs sexist,โ she said.