On Thursday, the singer shared a lengthy message via Instagram about his Lyme disease diagnosis, which he called "relentlessly debilitating."

Chris Kirkpatrick took to Instagram to shower praise on Timberlake, who revealed Thursday that he was diagnosed with the debilitating disease.

Chris Kirkpatrick is in awe that his former ‘NSync bandmate Justin Timberlake performed a full tour amid a battle with Lyme disease. "I've always known my little bro was tough - but this tour showed me a whole new level of strength,