Britney Spears was apparently scared after Kevin Federline threatened to have strands of her hair test for drugs. And that's why she shaved off all of her hair.
But here's today's update: Now her camp is claiming she went cue ball because of head lice!
A source said: "She thought lice were eating her hair extensions, so decided to get rid of them as soon as possible."
But yesterday's report was that K-Fed was at Britney's Malibu mansion last Friday when she got back from her one day in "rehab" and he wants her tested for drug use.
"They had a huge argument," a source said. "Kevin threatened Britney that he was going to have people test her hair to find out exactly what she's been up to. She was so scared. That was what made her have her head shaved."
Meanwhile, Britney is back in rehab today trying to deal with her breakdown.