The star and her boyfriend celebrate their year together. Plus: Mary-Kate Olsen, Britney Spears and more

  • ANNIVERSARY PARTY  photo | Mischa Barton

Credit: BAUER-GRIFFIN

Updated: Monday Mar 07, 2005 | 06:00 AM EST

ANNIVERSARY PARTY

All dolled up, The O.C. star Mischa Barton sparkles while out at Beverly Hills hot spot Koi on Thursday to celebrate her first anniversary with billionaire heir boyfriend Brandon Davis.