In this combination photo, Selena Gomez, left, attends the Harper's BAZAAR "Icons by Carine Roitfed"' party on Sept. 8, 2017 in New York and Francia Raisa attends the LA premiere of "13 Reasons Why" in Los Angeles on March 30, 2017.  Gomez said in an Instagram post on Thursday, Sept. 14, that due to her struggle with lupus she received a kidney transplant donated by Raisa.

In this combination photo, Selena Gomez, left, attends the Harper's BAZAAR "Icons by Carine Roitfed"' party on Sept. 8, 2017 in New York and Francia Raisa attends the LA premiere of "13 Reasons Why" in Los Angeles on March 30, 2017. Gomez said in an Instagram post on Thursday, Sept. 14, that due to her struggle with lupus she received a kidney transplant donated by Raisa.

/AP

Pop star Selena Gomez has had a very public battle lupus over the course of her career and Thursday she shared new, intimate details about her disease.

According to an Instagram post, the Grand Prairie-raised singer underwent a kidney transplant this summer necessary to improve her overall health. Her donor's name might also ring a bell: Actress Francia Raisa gave Gomez one her her kidneys, "the ultimate gift and sacrifice," Gomez wrote in her post, adding "I love you so much sis."

"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," Gomez wrote on Instagram with a touching photo of she and Raisa holding hands in the hospital. "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."

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According to NBC's medical correspondent, Dr. John Torres, kidney transplants can be common among those with lupus.

"Lupus is an autoimmune disease that can, among other things, affect the kidneys," he told the publication. "If it causes the immune system to attack the kidneys enough they can fail, requiring dialysis or a kidney transplant."

Gomez previously had chemotherapy to treat her disease and has been an advocate for mental health issues, specifically anxiety and depression, that come along with it. In her Instagram post, Gomez directed fans to Lupus Research Alliance for more information.

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