Cameron Diaz joined Boston Celtics basketball stars on Friday (11Sep09) to build a garden and basketball court at a school in Massachusetts.

The Mask star spent two hours building flower beds as part of a charity project the mark the anniversary of the 9/11 terrorist attacks.Elementary school students and other volunteers joined her at the Young Achievers Science and Mathematics Pilot School in Mattapan.Diaz is in Boston to film a new movie with Tom Cruise, which starts shooting next week (beg14Sep09).