The 25-year-old Gogglebox star and best-selling author uploaded the old school snaps to Instagram for Throwback Thursday, saying they were taken four years ago.
Her accompanying caption read: "A very Skinny Minnie Me. Ahhhh to be 21 & a size 6 again #tbt #throwbackthursday."
Scarlett has been open in recent days about her weight gain, saying she used to be a dancer but after going to university, the exercise stopped and she "discovered alcohol and kebabs."
She recently told Closer magazine: "I knew I was overweight but when I went to the doctor for a check up, she said: 'You're not overweight, you're obese.' I was really shocked; I almost cried.
"Going to the doctors has put a rocket up my bum. I need to get healthy and catch the fitness bug."
Fans on Instagram, however, were quick to tell Scarlett they think she looks beautiful right now. One user, @sallerina33, said: "Think you look great now lovely. We all want/need to loose a little weight but don't change too much."
Meanwhile, it was recently reported Gogglebox favourite Scarlett is in HUGE demand, having been approached to appear on the next series of I'm A Celebrity… Get Me Out Of Here! and have a regular role on Rylan Clark-Neal's new chatshow.
A rep for Gogglebox, however, has said: "Scarlett is not taking part in I'm A Celebrity and will continue to entertain Gogglebox fans from her sofa." They added that Scarlett was approached by producers of Rylan's show "but turned down the offer as it conflicts with her exclusive Gogglebox contract."
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