ONE celeb gets out of rehab, another goes in. On the heels of Britney Spears' release from the Promises clinic, Hollywood hunk Jesse Metcalfe checked himself in to an undisclosed rehab center for alcohol abuse this week, a rep for the star confirmed. This decision was made Monday, the day before Page Six broke the story of Metcalfe's weekend-long binge at the Mondrian hotel in L.A., where sources reported he looked like he hadn't slept in days and was acting "very angry" and "out of control." Now, Metcalfe's rep has sent us the following statement: "On Monday, March 19, Jesse Metcalfe entered a rehab facility to deal with alcohol issues. He realized he had a problem and was anxious to deal with it immediately. The actor, best known as the hunky gardener on the ABC show 'Desperate Housewives' and the star of the film 'John Tucker Must Die,' hopes that the media will allow him the privacy to deal properly with his treatment."