Fashion hunk Marc Jacobs is reportedly jealous of couture king John Galliano. Gossips say he loudly trash-mouths his rival during workouts at the David Barton Gym on West 23rd Street. A Page Six spy snips, "Marc and his trainer always talk very loudly - it's annoying. All he does is complain about Galliano - even after [Galliano's best friend and right-hand man] Stephen Robinson died in April. It was disgusting. He's so jealous of John."