The Vince Vaughn and Jennifer Aniston marriage talk just won't stop. An earlier report claimed that Vince had snagged a half-million dollar 9½-carat radiant-cut canary diamond engagement ring.

Jennifer & Vince Set to Marry: Part II (Image: Universal Studios)

Now Us Weekly claims that while on vacation in Mexico the couple couldn’t keep quiet anymore: “We’re getting married,” Jen told a friend, a source says.

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A report from the Us Weekly blog:

The big news capped off an otherwise calm, romantic trip. The duo divvied up their week between Girls Gone Wild founder Joe Francis’ Puerto Vallarta property and Cabo San Lucas, where they holed up in a $5,000-a-night, five-bedroom suite at the Villas Del Mar at Palmilla.

“They didn’t leave the resort too often,” says an employee. “She was a very quiet guest.” To celebrate their last night in Mexico June 2, they ordered in appetizers from local Mi Casa restaurant. “They seemed in love,” says a Cabo San Lucas hotel employee.

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Courteney Cox wouldn't reveal much about the couple in her Marie Claire cover story interview but did reveal that “They have fun, I’ll say that much,” she says in the August issue. “They spend a lot of time laughing.”

“They’re good for each other,” a source tells Us Weekly. “He makes her laugh.”

Us also revealed that upon their return to the US Vince was off to work. The Hollywood funnyman jetted to Carthage, South Dakota, to film Into the Wild.

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Meanwhile, Aniston hung out with friends, meeting up with pals to down fresh peach Bellinis at West Hollywood’s Il Sole June 29, Us reports.

No 'official announcement of course and us details that reps didn’t return calls for comment.

--Cathy Beers