Justin Timberlake revealed that he was diagnosed with Lyme disease during his Forget Tomorrow World Tour. "As many of you know, I'm a pretty private person. But as I'm reflecting on the tour and festival tour - I want to tell you a little bit about what's going on with me," the singer, 44, wrote via Instagram on Thursday, July 31, alongside photos from various tour performances. "Among other things, I've been battling some health issues, and was diagnosed with Lyme disease - which I don't say so you feel bad for me -- but to shed some light on what I've been up against behind the scenes.