A family source tells PEOPLE that the Grammy winner's diagnosis has "brought clarity to a series of unexplained issues" as Biel has been "incredibly supportive"

Many celebrities, including Justin Timberlake, allegedly contracted Lyme disease; here's the symptoms and best ways to treat it.

Justin Timberlake has announced on Instagram Thursday that he was diagnosed with Lyme disease. The former NSYNC singer shared the news in a post commemorating his two-year Forget Tomorrow tour, which wrapped in Turkey on Wednesday.