Melissa, 37, took a screen grab of herself during an episode of the US teen comedy before sharing it with fans on Twitter as part of the site's 'Throwback Thursday' trend.
The mum-of-three played the lead role of Clarissa from 1991 to 1994, and she later went on to land the main part in Sabrina The Teenage Witch.
In the shot, Melissa is sporting a rather funky 90s scrunchie, a pink and white striped shirt and a collection of friendship bracelets up her arm.
Alongside the picture, the actress made reference to her forthcoming autobiography Melissa Explains It All.
She said: "#tbt #throwbackthursday Clarissa Marie Darling! #clarissaexplainsitall #melissaexplainsitall #notarealjunkfoodfan #theymightbegiants."
Meanwhile, it has recently come to Reveal's attention that Melissa filmed a pilot for a Clarissa spin-off series, Clarissa Now, in 1995.
At the end of Clarissa Explains It All, Clarissa had landed an internship working as a journalist in New York and the pilot focuses on her first day on the job.
Watch the first part below!