Okay some chick who was in the tattoo shop with Britney says this:
She asked Britney why she shaved her head and Britney said that she was tired of having things plugged into her, and tired of people touching her and she was sick of it all.
The girl said that Britney was distrought and disturbed and very scatterbrained and wasn't answering many questions or making any sense in the tattoo parlor. She was very upset.
And she refused to say what other crazy tattoo Britney got-- she just said we'd see pictures. So I'm guessing there's more to the story...
OMG X17 has more pics:
X17 XCLUSIVE - BRITNEY'S CRY FOR HELP (X17 Online)