Presents celebrity-related news briefs as of January 13, 2003. At her December 6, 2003 sentencing for shoplifting, actress Winona Ryder was hit with 480 hours of community service that she must complete by April 7. She'll spend 120 hours at Caring for Children and Families with AIDS, which runs two group homes for children. Actress Courteney Cox, who has bought a half-dozen homes in Los Angeles, California, then sold them after remodeling, has just purchased two more, according to a neighbor. Actress Natalie Portman and singer Britney Spears are planning to throw a joint dinner party in the penthouse of Manhattan's Hudson hotel in New York City for New Year's Eve, 2003.