Just Jared announced about possible Jen and Vince split. Here's the scoop:

“After weeks of distance both emotional and real, the relationship ax fell the week of September 9 for Vince Vaughn and Jennifer Aniston. A source close to Vaughn tells Us that the split happened just before the actor left for London to begin work on his holiday comedy, Joe Clause. “It’s not common knowledge, but we’re not together anymore,” Vaughn told the insider September 13, adding that they solidified the breakup in a long phone conversation. “We’ve split up.”
Confirms an Aniston pal: “They’re 100 percent done.”
Soon afterward, Vaughn, 36, canceled plans for Aniston, 37, to visit him in London for a September 23 party, says the source. What went wrong? Source tell Us that the relationship began to unravel almost immediately after Vaughn’s June 27 proposal to Aniston.”