The baby was born on Thursday at Cedars Sinai Medical Center in Los Angeles, the magazine said yesterdaay on its Web site.
No other details were given about the couple who have been together since 2003.
The 31-year-old Maguire's movie credits include ''The Cider House Rules,'' ''Seabiscuit,'' and the three blockbuster ''Spider-Man'' films. Meyer, 29, is a jewelry designer and daughter of Universal Studios executive Ron Meyer.
REUTERS SP RN0856