Jennifer Aniston, Vince Vaughn Split Up

It's a good thing the term "Vinnifer" never really caught on. How come?

Because the relationship between Jennifer Aniston and Vince Vauhgn is over, reports Us Weekly.

And it's not a new development. The couple came to an end during the week of September 9, just before the actor left for London to begin work on his holiday comedy, Joe Claus.

"It's not common knowledge, but we're not together anymore," Vaughn told a source on September 13, adding that they solidified the breakup in a long phone conversation. "We've split up."

An Aniston friend - not Courtney Cox Arquette - confirmed as much: "They're 100 percent done."

So, what went wrong? Evidently, the relationship began to unravel almost immediately after Vaughn's June 27 proposal to Aniston.

Of course, there are many unanswered questions. Like, what happened to the engagement ring? And do rumors of Brad Pitt pressuring Angelina Jolie into having more kids play any role in this break-up?

We're not saying we have answers. Just that there are questions.