Did Britney Spears shave her head torebel against her overprotective mother — or just to give her overtreated tresses some tough love?

The pop star’s bizarre buzz cut this weekend sparked talk that Britney was going through a very public meltdown. But the troubled diva (who has been sporting a blond wig on her newly bald head) may just have been acting out. A source told Web site X17 that after arguing with her mother over her sudden departure from rehab (Britney spent less than 24 hours at the Crossroads treatment facility before ditching), the 25-year-old singer shaved her head as an act of defiance.