Britney Spears and Jason Alexander were childhood friends who probably should have stayed that way: The pop diva made headlines when she married her longtime pal from Kentwood, La., on Jan. 3 in Las Vegas. Fifty-five hours later, the union was annulled. Fast-forward to her Sept. 18 wedding to Kevin Federline, whom she started dating in April. "I finally found my prince," she says. Now a stepmom to his daughter Kori, 2, and 5-month-old son Kaleb, Spears looks forward to "being a young mom."