A post shared by Selena Gomez (@selenagomez) on Sep 14, 2017 at 3:07am PDT

Selena Gomez has revealed that she has undergone kidney transplant due to her battle with lupus.

The singer announced the news on Instagram this Thursday with a photo of her in a hospital bed, sharing that it was a friend of hers who donated the organ.

In a heartfelt letter, the "Hands to Myself" hitmaker thanked her friend, whom she said gave her the "ultimate gift." She also showed photos of her scars as she openly talked about her health.

"I’m very aware some of my fans had noticed I was laying low for part of the summer and questioning why I wasn’t promoting my new music, which I was extremely proud of," she began.

"So I found out I needed to get a kidney transplant due to my lupus and was recovering. It was what I needed to do for my overall health.

"I honestly look forward to sharing with you, soon my journey through these past several months as I have always wanted to do with you. Until then I want to publicly thank my family and incredible team of doctors for everything they have done for me prior to and post-surgery.

"And finally, there aren’t words to describe how I can possibly thank my beautiful friend Francia Raisa. She gave me the ultimate gift and sacrifice by donating her kidney to me."

Gomez, who first shot to fame for her Disney Channel shows, is an award-winning singer who has sold more than 7 million albums and 22 million singles worldwide.

She first revealed her battle with Lupus back in 2015.

She held a concert in the Philippines back in July 2016.