, 20, has made a plea on behalf of Lisa Gershowitz Flynn, 41, a New York City leukemia patient and mother of two. Last November Flynn was diagnosed with Acute Myelogenous Leukemia, an aggressive form of cancer, and was told she needed to find a bone marrow donor match. The Grammy winner, who works with DKMS—the largest marrow donor center—told PEOPLE, "When I heard about Lisa's plight, my heart broke." Since the singer intervened Feb. 20, nearly 3,000 potential donors have come forward. "For Rihanna
to even be thinking about helping others and putting herself out there when she is so busy with her career is tremendous," says the mom of Michael, 5, and Alexandra, 3.
Isaac Hanson, 27, of the pop rock trio Hanson, and wife Nicole, 24, are awaiting their second child. The couple have a son Clark Everett, 11 months.
, 21, settled a suit in Los Angeles Feb. 20 brought by busboy Raymundo Ortega, who claimed the actress was negligent when her convertible collided with his van in 2005. Ortega had accused her of consuming alcohol just before the crash and sought $200,000 in damages. Lohan denied the allegation and countersued for $75,000. The terms of the agreement were not disclosed.... Actress Elizabeth Hurley, 42, and textiles heir husband Arun Nayar, 43, agreed last month to pay an undisclosed settlement to former maid Violet D'Souza, 31, who accused them of paying her as little as $2.36 per hour (minimum wage in England is around $10.86). D'Souza claimed she worked nearly 70 hours a week, up to 7 days a week, at the couple's home in London's posh Chelsea area before being fired last August. Hurley's rep had no comment.... Jerry Seinfeld, 53, said he was joking when he called author Missy Chase Lapine, 44, a "wacko" celebrity stalker on Late Show with David Letterman last October. Lapine, who accused Seinfeld's wife, Jessica, of stealing her idea for a family cookbook, sued the couple in New York City, accusing Jerry of defamation and Jessica of trademark infringement. A Feb. 22 formal response argues the comedian simply made "overstatements of opinion for comic effect." ... Mischa Barton
, 22, was formally charged in Los Angeles Feb. 26 with misdemeanor DUI, marijuana possession and driving without a license, stemming from her arrest in West Hollywood last December. A rep for the actress could not be reached for comment.