Jennifer Adkin, 24, who has slimmed down from 17st 5lb to an incredible 9st 5lb, was named Miss Yorkshire at an event in Leeds to secure her place in the final.
Her victory comes a few weeks after missing out on the title of Miss Sheffield at an event in the city.
The administrator has turned her life around and if she is successful in the Miss England final, she could go on to represent the nation at Miss World.
After being dumped nine months before her wedding, Jen decided to swap junk food for the gym - and slimmed down from a size 22 to a size ten.
The beauty queen, who has now found love again, said: “Although I wish my ex all the best, I do secretly hope he’s kicking himself.
“When we broke up, I was devastated but it ended up being the best thing that’s happened to me.”
When she met her ex in March 2011, she weighed in at 14st 7lb and she said: “In the week, I ate huge portions of pasta or pizza then a family-size chocolate bar.
"At weekends, we’d turn into virtual recluses sitting on the sofa in our pyjamas eating takeaways, spending £20 each time."
The habit saw her weight balloon to more than 17st and in 2015, with the pair planning to wed, her ex suddenly ended the relationship.
She said: “The day he left I thought my world had ended. I cried for weeks and used food as my comfort.
“Being so overweight, I thought no other man would ever find me attractive.”
However, Jen from Ulceby, Lincolnshire, signed up for a local gym - and has never looked back and her victory means she progresses to the Miss England final with a shot at the Miss World crown after that.
She will be joined at the contest by Grace Hardy, a Sheffield student, who won the Miss Charity Yorkshire title after raising £1700 for the Miss World charity Beauty with a Purpose which recently funded a sensory rooms at Landmarks College in Sheffield for autistic children and young adults.
Keira Ensall Brennan, a freestyle dancer from Doncaster, won the social media vote and won a place in Miss Social Media round of Miss England on Saturday 27th May at The Sanctuary Workshops Leicester for another chance of qualifying for the Miss England contest.
The Miss England final will be held at Resorts World Birmingham on July 14.