Britney Spears pays birthday tribute to her sons amid family drama ... and CRIES in dancing clip

Britney Spears Wishes Her Two Sons Happy Birthday Amid Their Estrangement

Britney Spears' Ex-Husband Jason Alexander Wanted By Police for Missing Court Date

Britney Spears Apologizes to Sons, Insists She Wants to Feel 'Valued': 'Sorry If I Ever Hurt You'