She is best known for her studio albums, music videos, and songs such as "...Baby One More Time" and "Oops!...I Did It Again". In the early 2000s, Spears's success as a singer led her way to high-profile advertising deals and endorsements, as well as forays into other forms of media, including film and reality television. Her third and fourth albums, Britney and In the Zone, were released during this era. In 2004, she married back-up dancer and aspiring rap artist Kevin Federline, and the following year she gave birth to their first son, Sean Preston. Their second son, Jayden James, was born in 2006. Spears filed for divorce from Federline on November 7, 2006 citing irreconcilable differences.
More Recently she has been reported as saying she shaved her head as a tribute to her aunt who had died from cancer, a friend claims.
The singer stunned the world when she cut off all her hair in full view of paparazzi at a Los Angeles salon in February. She followed the stunt with a spell in rehab, but a pal claims Spears was suffering post-partum depression and grief and shaved off her hair as an act of "solidarity."
The salon that shaved her head posted the hair on E-bay and reportedly earned over $1 million to the owner. You can see the story below that was featured on youtube.com
