Britney's Little Sis

Actress Jamie-Lynn Spears arrives at the Us Weekly Hot Hollywood Party at Opera on Sept. 26, 2007, in Los Angeles. Britney's little sister revealed to OK! magazine in a story published Tuesday, Dec. 18, 2007, that she was pregnant and that the father is her longtime boyfriend, Casey Aldridge.

Actress Jamie Lynn Spears arrives at the Teen Vogue Young Hollywood Party in Los Angeles on Sept. 20, 2007. Spears is the telegenic heroine of the popular Nickelodeon series "Zoey 101."

Actress Jamie Lynn Spears attends the "Nancy Drew" film premiere at Grauman's Chinese Theatre on June 9, 2007, in Hollywood, Calif.

Singer Chris Brown, left, and actress Jamie Lynn Spears at the 20th Annual Kid's Choice Awards held at the UCLA Pauley Pavilion on March 31, 2007, in Westwood, Calif.

Jamie Lynn Spears arrives at the 20th Annual Kids' Choice Awards in Los Angeles, on Saturday, March 31, 2007.

Nickelodeon television personalities Jamie Lynn Spears, left, and Devon Werkheiser speak at the Nickelodeon 2007 Upfront presentation at the Nokia Theatre on March 8, 2007 in New York.

Celebrity Sports Fans — GETTY/Noah Graham/NBAE

Britney Spears, left, stands courtside with sister Jamie Lynn as the Los Angeles Lakers play against the Washington Wizards on December 17, 2006, at Staples Center in Los Angeles.

Britney Spears walks through the crowd with sister Jamie Lynn Spears as the Los Angeles Lakers play the Washington Wizards on Dec. 17, 2006, at Staples Center in Los Angeles.

Jamie Lynn Spears arrives at the premiere of "Charlotte's Web" in the Hollywood section of Los Angeles Sunday, Dec. 10, 2006.

Actress Jamie Lynn Spears, right, and mother Lynne Spears arrive at Sony Pictures premiere of "Monster House" held at Mann's Village Theatre on July 17, 2006, in Westwood, Calif.

Actors, from left, Christopher Massey, Paul Butcher, Erin Sanders, Victoria Justice and Jamie Lynn Spears pose for photographers at the premiere of "Monster House" at Mann's Village Theatre in Westwood, Calif., on July 17, 2006.

Jamie Lynn Spears accepts her award for Favorite TV Actress at the Kids' Choice Awards, Saturday, April 1, 2006, in Los Angeles.

Jamie Lynn Spears poses at the Distinctive Assets lounge for Nickelodeon's Kid's Choice Awards on April 3, 2004. in Westwood, Calif.

Actress Jamie Lynn Spears of Nickelodeon's "All That" attends the 30th Annual Vision Awards To Fight Blindness Gala at the Beverly Hilton Hotel on June 28, 2003, in Beverly Hills, Calif.

Britney And Jamie Lynn Spears — GETTY IMAGES/Frank Micelotta

Britney Spears and Jamie Lynn Spears backstage during Nickelodeon's 16th Annual Kids' Choice Awards at the Barker Hangar April 12, 2003, in Santa Monica, Calif.

Britney Spears and her sister Jamie Lynn Spears at the 2002 Teen Choice Awards at the Universal Amphitheatre in Los Angeles, Sunday, Aug. 4, 2002.