Jennifer Aniston IS Engaged to Vince Vaughn!

Hey, remember when we say Jennifer Aniston was not engaged to Vince Vaughn? Well, it was true at the time.

But times change. Us Weekly reports that Vinifer is, indeed, now hearing wedding bells. During a recent week-long Mexican vacation, the couple couldn't keep quiet anymore: "We're getting married," Jen told a friend.

The big news capped off a calm, romantic trip.

"They didn't leave the resort too often," says an employee. "She was a very quiet guest."

And, now, a very happy one. To celebrate their last night in Mexico, Aniston and Vaughn ordered appetizers from a local Mi Casa restaurant and "seemed in love," says a Cabo San Lucas hotel employee.

That always helps when you're getting married. Courteney Cox, meanwhile, sees a bright future for the pair.

"They have fun, I'll say that much," she says in the August issue of Marie Claire. "They spend a lot of time laughing."