Selena Gomez's BFF I Wrote My Will Before Transplant

10/30/2017 8:13 AM PDT

Selena Gomez and Francia Raisa Talk Kidney Transplant on 'Today'

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Selena Gomez's best friend, Francia Raisa, didn't know if she'd survive donating a kidney to her BFF ... which really hit home when she had to write a will.

Francia and Selena told "Today" the donation process had to be sped up because Selena was in such dire straits she couldn't even open a water bottle. What normally takes months was done in days.

Selena also thanked Francia for volunteering her kidney without being asked ... once she found out she was a blood match, which is extremely rare.