The Inbetweeners actress was on the ITV show to take part in a Zumba class with host Lorraine Kelly.
However, Emily Atack, 29, didn’t impress all Lorraine viewers.
Many blasted the I’m a Celebrity star for “playing up to the cameras”.
This came after Emily pulled faces throughout the fitness class and twerked for Lorraine, 59.
“Emily’s so affected and over the top”
One fan scolded on Twitter: “I really dislike Emily, she’s so affected and over the top.”
While another asked: “Is this Emily woman incapable of mugging for the camera for at least ten seconds?”
A third chimed in: “Emily Atack would turn up for the opening of a tin of tuna.”
Despite the backlash, some viewers enjoyed her on the show.
One exclaimed: “Emily Atack doing Zumba on Lorraine is brilliant! Reminds me of myself in Zumba.”
Another added: “You were brilliant Emily and I just loved your facial expressions.”
Emily is soon to embark on a comedy tour after her stint in the jungle.
Her show, Emily Atack: Talk Thirty To Me, kicks off in Crawley in April.
Lorraine airs weekdays on ITV at 8:30am.