That fateful night was ten years ago today -- when photos of Britney Spears shaving her head came streaming into our system and ... well, we couldn't believe our eyes.

On February 16, 2007, Britney went to Esther's Haircutting Studio in Tarzana, Calif. and took an electric razor to her head. Britney was in the middle of a bitter divorce and custody battle with Kevin Federline and was reportedly battling addition and mental illness.

After she sheered off all her locks, she headed to Body & Soul tattoo parlor in Sherman Oaks and got inked on her hip and wrist.

A few days later, as our photographers photographed Britney trying to see her boys at Kevin Federline's house in Tarzana, it all become too much for her and she grabbed an umbrella and smashed a photog's car window and even hit one guy across the back.

It took months of erratic behavior, pink wigs, English accents and various hangers-on trying to "help" Brit before her family finally had her committed on a 5150 involuntary psychiatric hold in January 2008. Since then, Britney has been under the conservatorship of an attorney and her father.

It was a wild time, for sure and X17 was there to document it all -- even behind closed doors with Britney when the pop star invited our photographers into her home, asked them for rides, texted them and spoke to one of them in a tanning salon booth in this memorable clip ...

Take a stroll down memory lane in this gallery ...