Leighton Meester carries her extra-long surfboard on the beach in Malibu on Mother's Day

Paris Hilton cradles her black Chihuahua Diamond while in Malibu with fiancé Carter Reum

Simon Cowell is casual as he goes shopping with Lauren Silverman and son Eric in Malibu

Chris Martin rocks a blue T-shirt while filming a new music video in Malibu