We don't know if there's ever been a bigger red flag than the one Britney Spears
waved when she shaved off ALL
of her hair in February 2007.
In the midst of a heartbreaking divorce with her reality-TV partner slash hubby at the time, Kevin Federline
, Spears became a car wreck—sort of literally—a week of madness culminating with her bashing in an SUV with an umbrella.
It came as no surprise when she checked herself back into rehab.