Britney Spears has come a long way from the girl who spent her days and nights taking erratic car rides through Los Angeles. These days, the 26-year-old mother of two can occasionally be seen enjoying a relatively quiet lunch or dinner, but then it's back to her Studio City home, where she largely stays out of the spotlight.Sources say the reason for Britney's dramatic turnaround is the fight for her children, which she has resumed with a vengeance. "Britney wants her kids back," one insider reveals to OK!. "And she will do everything in her power to make that goal a reality."On May 6, Britney, along with her dad and legal team, is prepared to go before Los Angeles County Superior Court Commissioner Scott Gordon and ask yet again for overnight visits with her adorable kids, Sean Preston, 2, and Jayden James, 19 months.If she succeeds in this battle, Brit will be allowed one precious evening per week with her children for the first time since her infamous hostage standoff on Jan. 3.Appearing in court will only be the first step toward regaining even partial custody of her boys in the 50/50 agreement that Britney and her ex Kevin Federline, 30, agreed upon when they finalized their divorce last July. The second step is a closer, more peaceful relationship with Kevin. "It would be fantastic if they could become great friends again and could get together like Bruce Willis and Demi Moore did to show their kids how much they love them," a relative of Kevin tells OK!. "I think both Brit and Kevin would be open to that eventually."And according to Kevin's attorney, Mark Vincent Kaplan, Britney is well on her way to achieving both goals. "Britney's progress over the last two months is good," he tells OK! exclusively. "No surprises, nothing to be alarmed about, and that's all very positive. -OK!