Jamie Lynn Spears, expecting: Way to take the spotlight off your big sis, Jamie Lynn! The 16-year-old high school junior revealed on Dec. 18 that she was several months pregnant and plans to keep the baby. Her on-and-off boyfriend, Casey Aldridge, is the daddy. Britney was reported to be "frantic" at the news. Should be an interesting 2008. (Todd Williamson/WireImage.com)