Congratulations on this magnificent milestone in your life! I’m sending my very best wishes your way as you celebrate your special 16th birthday today!
My love, you are somebody so special to me that you simply don’t have to wait until your birthday to receive your wishes from me. Happy birthday in advance, handsome!
The only thing that could make the best birthday wishes for my best friend even better is if they were to arrive early! Happy birthday in advance, my friend!
May this birthday of yours be another fabulous one in a long line of beautiful celebrations and magnificent milestones in your life! A best friend as truly dear as you are to me deserves as many glorious moments in her life as possible.