Belieber Catherine Alter of Darien, CT, was diagnosed with Leukemia in March. She's been fighting incredibly hard through chemo treatments since last week, and all she wants for her upcoming birthday is to meet Justin Bieber!

You can help her birthday wish come true! Tweet #JustInTimeForCath at the handles @justinbieber and @jaltersports ! All of us at Z100 are rooting for you, Catherine!