In mid-September, the world learned that Francia Raísa is a hero and the best friend in the world. Selena Gomez revealed in an Instagram post that she underwent a life-saving kidney transplant because her BFF altruistically donated an organ. More than a month later, Gomez, who revealed her lupus diagnosis in 2015, has opened up about the procedure and about Raísa’s noble actions.

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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: -by grace through faith

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In an interview with The Today Show‘s Savannah Guthrie, scheduled to air next week, Gomez tearfully talks about learning her kidneys had failed her. “My kidneys were just done. That was it,” she said. “I didn’t want to ask a single person in my life, and that was the day I came home when I found out and she volunteered and did it.” When Guthrie asked Gomez why she felt Francia saved her life, Gomez simply said, “Because she did. That’s it.”

Check out the emotional clip below: