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," Kirkpatrick, 53, wrote via Instagram on Thursday, July 31. "Watching him battle Lyme disease day in and day out, while still getting on that stage night after night, was something I'll never forget." He added, "The long days, the travel, the exhaustion - and yet, he never gave up. No complaints, no excuses - just heart, grit, and pure determination.