"I'm pumped for her," he continued. "I'm happy to see that she's doing well, it seems, and that she was able to get the surgery. And her friend helping her is a beautiful thing. It's all amazing."
Gomez surprised her supporters with the announcement on Thursday, revealing that complications from chronic autoimmune disease lupus forced her to lay low and put off publicly promoting her new singles "Bad Liar" and "Fetish" until she recovers.
"There aren't words to describe how I can possibly thank my beautiful friend Francia Raisa," she wrote. "She gave me the ultimate gift and sacrifice by donating her kidney to me. I am incredibly blessed. I love you so much sis."
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Jonas and Gomez say they had a "puppy love" relationship in 2008 when they were both Disney Channel stars. They have remained good friends since then, occasionally sparking new dating rumors -- but it was Gomez's current boyfriend The Weeknd who was at her side during the medical emergency, scheduling his performances around her operation so he could be with her, according to PEOPLE."It was a super serious operation," a source told PEOPLE, "and all her friends were worried."