The former Liberty X singer thanked her fans on Twitter for their support following the surgery to remove both her breasts yesterday (November 20).
She wrote: "Thank u for all your lovely tweets. It went well, but I'm obviously very sore & disorientated still. I have the best doctors & husband Eva!x"
Before the operation, she tweeted: "Thank u so much 4 your well wishes. Sorry I can't get back 2 u all, though I have read every1. On way 2hospital now. Love u all, Michelle xx."
She also posted a photo of herself with daughter Faith, adding: "My last cuddle with #babyfaith before my op.. dont know when she will be able to cuddle upto me again.. big day 2moz X."
Heaton was recently diagnosed with having the BRCA2 gene, which carries an 80% chance of contracting cancer.
Last month, she confirmed that she was planning to have a double mastectomy. She also said that she will eventually have her ovaries removed once she has another child with husband Hugh Hanley.
Speaking about the operation, Heaton recently told Closer: "Without going into the gory details, we've decided that the surgeons are going to try and keep my nipples, which is amazing.
"Sometimes you can't, or you try to and the tissue dies. There's a good chance I can keep them, but if the blood supply isn't good enough, they won't be able to.
"If I do keep them, they won't have any sensation, but there will be less scarring, so fingers crossed."
She added: "I'll get implants in the same operation.
"The reconstruction surgeon Mr Mosahebi ruled out using my own tissue from either my thighs, bottom or stomach, as there wasn't enough tissue and the recovery time would be far more than six weeks."