Britain's Got Talent finalist yesterday praised Simon Cowell from her US hospital bed - after he paid £175,000 for her life-changing surgery.
Julia Carlile, 15, revealed last April on the show that without surgery in America on her spinal condition scoliosis she will never dance again.
She and her troupe MerseyGirls landed Alesha Dixon's Golden Buzzer after sharing her story on the show.
But despite not winning, head judge Simon Cowell was so deeply moved he paid anyway for Julia to fly to the US for the £175,000 back op.
Now Julia has revealed on social media that both her operations have all worked, she is recovering and will dance again after all.
And praising Cowell, 57, for his generosity in changing her life, she added: "Second surgery was a success!
"Now on the road to recovery. Thank you @SimonCowell @CowellOnline #strong #recovery #fighter."
Made up of best friends Julia with 17-year-olds Annie and Alice, Rebecca, 16, and 14-year-old Poppy, the troupe entered BGT 2017 to highlight the rare spinal condition.
They told viewers that if they won, they would use the £250,000 prize fund for Julia's life-changing spinal surgery.
Without the £175k operation, not available in the UK, Julia would be unable to continue her passion of dancing.
The operation, called vertebral body tethering, involves screws being fixed along a cord inside the back.
The recovery time is just six weeks and the operation is reversible if it does not work - but sadly it is not currently available on the NHS.
Had Julia undergone NHS surgery, she would have had an operation which involved fusing the spine with metal rods - leaving her unable to dance.
The dancers failed to win the show - which was scooped by pianist Tokio Myers.
During the live final, Merseygirls' lead dancer Julia almost suffered a nasty accident after a chair she was using as a prop started to move.
The dance troupe's energetic performance got off to a brilliant start but as Julia stepped onto a chair, it suddenly tipped to one side.
Her friends quickly jumped up from their positions and grabbed onto her arm to steady her.
Julia grinned and carried on as best she could but it is feared the bad luck cost them the win.
But Cowell was so touched by Julia's determination he offered to pay for her surgery even though the girls missed out on being crowned champions.
Before their final performance lead member Julia told the show: "When I'm dancing I just feel like a normal kid, I completely forget about my condition.
"This could be my last performance with the girls before my surgery which is a really scary thought.
"My operation is a risk because it could mean I will never dance again. The support has been incredible."
Julia later told how after the show the X Factor mogul offered to foot the bill for her.
She said: "Simon came and spoke to us backstage.
"Just walking off stage and he said he was paying for it and I couldn't believe it.
"Simon offering to pay for my surgery was so overwhelming and dancing on stage with your friends is the best feeling in the world.
"There are no words to thank him for how grateful we are. It's just unbelievable. It does not feel real."
Julia flew out to New Jersey last July 23rd with her family for the operation and was delighted when her gran later jetted out too to surprise her.
On July 25th - after the first operation - the rest of the MerseyGirls group revealed: "Julia has done it!
"First operation done, we are so proud of her and missing her so much.
"We want to give her a massive hug, our girl is a fighter."
Julia wrote: "Surgery update - my first surgery went well. Recovery is the hardest thing i have ever done but I'm getting there! Roll on surgery No.2."
On Thursday she added a picture of her athletically limbering up in the hospital, with the words: "9 days post op and I'm dancing already.
"It was a long bumpy road to recovery but I did it! Second op tomorrow."
Now on Sunday she has delighted fans by revealing that her second operation has also been successful.
She wrote: "Second surgery was a success! Now on the road to recovery. Thankyou @SimonCowell @CowellOnline #strong #recovery #fighter."