Yep, Britney's well-storied downward spiral has been so severe that we had to give her two entries in our list of the most public celeb meltdowns. After the head-shaving trauma, Britney only continued to grow more and more out of control, with another rehab stint, multiple flings, erratic driving trips, hooking up with the mysterious and creepy Sam Lufti, and losing custody of her children. But she topped, or rather bottomed out on, all that with a January 2008 episode in which she barricaded herself in her bathroom, reportedly half-naked, with son Jayden. Police and ambulance were called to the scene, where Britney was transported, via ambulance, to the Cedars-Sinai psych ward.