The pop singer, the most followed person on Instagram, posted a picture to her 126 million followers of herself and Raisa holding hands from adjoining hospital beds. Another picture showed a large scar across her abdomen.

Gomez, who has released several recent singles including the New Wave-ish "Bad Liar," acknowledged that fans have wondered why she has done little publicly to promote the music.

"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," she wrote.

"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."

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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. 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. I am incredibly blessed. I love you so much sis. Lupus continues to be very misunderstood but progress is being made. For more information regarding Lupus please go to the Lupus Research Alliance website: www.lupusresearch.org/ -by grace through faith

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

She poured thanks to Raisa, best known for roles in the ABC series "The Secret Life of the American Teenager" and the cheerleader comedy film "Bring It On: All or Nothing."

"She gave me the ultimate gift and sacrifice by donating her kidney to me. I am incredibly blessed. I love you so much sis," Gomez wrote.

The 25-year-old former child star revealed in 2015 that she was diagnosed with lupus, a chronic disease in which the body's immune system fights healthy tissue. 

She secretly underwent chemotherapy at the time and last year cut short a world tour, saying she needed time to handle the effects of lupus including anxiety, panic attacks and depression.

Gomez on Instagram said the disease remained "very misunderstood" and encouraged fans to visit the website of the Lupus Research Alliance.

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