Speaking to The Daily Telegraph, the 28-year-old revealed: “I have been in a lot of pain for the past couple of years.”
Watkins told the publication that it had been “difficult decision” to get the surgery in order to manage the pain of the chronic condition.
Watkins will be hospitalised on the same day she was set to perform with the Wiggles for their Gold Coast show.
She also confirmed she'll be replaced by an understudy at shows in South Australia from April 21 to 30 and in NSW from May 12 to 20.
After the new broke, the actress and singer took to Instagram to thank her fans and their parents for their supportive messages.
"You may have seen this morning that I have been diagnosed with Endometriosis. 💛💛 Thank you to all your support and sending love to all women suffering with Endometriosis 💕," she wrote alongside a candid snap of herself smelling some flowers.
Wishing her successful surgery and speedy recovery!