Just a few weeks after their maximum visibility Oscar date, Jennifer Aniston, 40, and singer John Mayer, 31, have broken up again. After the Oscars, Jen went to Europe to promote her film Marley & Me while John remained in L.A. But when Jen returned this week, John broke up with her for a second time. The duo had previously split last summer only to reunite in recent months. They even appeared for their "coming out" as a couple on Oprah's post-Oscar show. (Photo: WENN)