The Spears in Review, 2007

It's been quite a year for the Spears girls.

Britney shaved her head bald, checked in and out of rehab, and wielded a 3-foot-long umbrella at photographers ... all before March!

The singer went on to jump into the ocean clad in only her bra and panties, bomb at the MTV Video Music Awards, and she ran a red light with her two young sons in the back seat of her car -- all the while skipping hearings in her child-custody battle with ex-husband Kevin Federline to party hop all over the country.

Next to her older sister, Jamie Lynn Spears, 16, seemed like a saint. Until, of course, the star of Nickelodeon's hit TV show "Zoey 101," revealed to OK Magazine that she's pregnant.

Scroll through the photos below to relive the drama the Spears sisters created over the past year. They may not be role models, but in 2007, they were definitely the most buzz-worthy siblings in Hollywood.

On Feb. 16, Spears decided to cut it all off and go bald. She walked into a hair salon and asked owner Esther Tognozzi to cut off all her hair. When Tognozzi refused, Spears took the shears and did the job herself. According to salon owner Tognozzi, Spears showed little emotion as she chopped off her brunette locks, except for tears in her eyes and voicing fear over her mother's reaction when she looked at her newly shorn head in the mirror.

Before Rihanna made umbrellas famous this past summer, it was Britney who used one to attack paparazzi in February. The troubled pop star was reportedly furious at ex-husband Federline when he refused to let her see her boys late one night. Spears then went berserk and started hitting an empty SUV with an umbrella.

Once known as the innocent younger sister, Jamie Lynn strolls with her longtime boyfriend Casey Aldridge, 19. OK Magazine reports that the couple started dating when Jamie Lynn was 13 and Casey was 16.