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"

Justin Timberlake said he's "not doing s--- today" after wrapping up his two-year international tour, during which he was diagnosed with Lyme disease.

Timberlake, 44, opened up about his "debilitating" Lyme disease symptoms after coming under criticism for his tour performances.