People News Report: Britney Spears undergoing 72-hour mental evaluation 01/04/2008 Britney Spears is undergoing a 72-hour mental evaluation at a Los Angeles hospital after refusing to give her son back to her ex-husband at the end of a visit. Read More RELATED NEWS Jimmy Fallon's 'The Tonight Show' dropping to only four nights a weekAshley Tisdale announces birth of her second childSelena Gomez is a billionaire TAGS: Britney Spears Kevin Federline