April 1999: Poses on the cover of Rolling Stone lying on a bed, scantily clad; angers parent groups and religious organizations alike.
Sept. 6, 2001: At the MTV Video Music Awards performs "I'm a Slave 4 U" with a live boa on her shoulders; angers PETA and parents groups (again).
Aug. 28, 2003: Ms. Spears and Christina Aguilera lock lips with Madonna as part of the 2003 VMA opening performance.
2004: She becomes involved with Kabbalah.
Oct. 6, 2004: She marries Kevin Federline, has two children with him (Sean and Jayden). They file for divorce in 2006.
June 15, 2006: In an interview with Matt Lauer, Ms. Spears is much heavier than usual, speaking with a heavy Southern twang, and sports fake eyelashes that seem to fall off during the interview as tears flow.
Feb. 17, 2007: Shaves her head, attacks paparazzi with umbrellas.
Sept. 9, 2007: Appears visibly nervous and out of shape as she performs for the first time in three years at the MTV VMAs. She very clearly lip-syncs the lyrics of "Gimme More." The performance is panned by critics and fans alike, who begin to doubt her comeback.
Oct. 15, 2008: "Womanizer" becomes her second Billboard Hot 100 No. 1 single, her first song to do so in nearly a decade.
March 25, 2011: "Femme Fatale," the seventh studio album, is released. The album has thus far produced three hit singles ("Hold It Against Me," "Till the World Ends" and "I Wanna Go.")
Aug. 28, 2011: A Britney Spears tribute is planned at MTV's annual VMA ceremony, with Madonna presenting Ms. Spears with a Lifetime Achievement award. A list of alleged performers credits Katy Perry belting "Oops! I Did It Again" and Lady Gaga tackling "Circus" as part of the tribute, with Ms. Spears rounding out the rest of possible performances (which also includes Janet Jackson, Ke$ha, Nicki Minaj, Selena Gomez and Demi Lovato) with a mash-up of "Hold It Against Me" and "I Wanna Go.