Us Weekly says Vince Vaughn and Jennifer Aniston are engaged, and the magazine is sticking by its story, even though Aniston's camp issued a quick denial.
"It's just not true," Anniston spokesman Stephen Huvane tells ABCNEWS.com. "Their report is erroneous. They are not engaged."
The announcement set off a small firestorm among celebrity magazines and Web sites, some chuckling that Us will have to back down from its cover story that proclaims "Vince Proposes," while others are saying they've been engaged for months, and the relationship is actually in trouble.
"We stand by our report," an Us spokeswoman says.
According to the story, which quotes unnamed sources, the 36-year-old "Swingers" star popped the question on July 27, just as the couple was returning from a vacation at Casa Aramara, just north of Puerto Vallarta, Mexico.
The couple had just ended a nine-day vacation at the $25 million coastal retreat of "Girls Gone Wild" founder Joe Francis.
According to the report, Vaughn presented his 37-year-old girlfriend with an engagement ring from jeweler Suzy Fabrikant that boasts a $500,000 diamond.
A friend of the couple saw them a few days later, dining with friends Courteney Cox and husband David Arquette at Wolfgang Puck's Beverly Hills eatery, Cut, when they supposedly announced the good news, Us reports.
"Vince stood behind Jennifer and put his arm on her shoulder, letting her know that he was there," the source tells the magazine. "You could tell they tried not to be too touchy-feely, but they are obviously happy together."
'This Is Old News to Us'
Despite Aniston's denial, a whirlwind of rumors surrounds the couple, who've been hesitant to talk about their relationship.
"This is old news to us," says Life & Style editor-in-chief Debra Birnbaum. "We reported that they got engaged two months ago."
Earlier in the day, as Us unveiled its cover story, the publicist at Birnbaum's magazine sent out a mass email to reporters, saying "Life & Style Told You First!"
"I do think it's funny that Aniston's spokesman is denying that they are engaged," says Birnbaum. "I don't think that spokesmen for either one of them ever confirmed they were going out."
While Life & Style is now claiming that Vaughn and Aniston have since put their wedding plans on hold, Star magazine is saying that Matthew McConaughey has been "moving in" on Aniston since his breakup with Penelope Cruz.
Meanwhile, the E! News website is taking swipes at both magazines, saying the "friend" that Us quotes in its story, "fell out of the loop at some point."
"To break it down: Life & Style reports engagement, Us Weekly denies engagement, Life & Style reports breakup, Us Weekly counters with engagement report, Life & Style conveniently forgets prior breakup report, points finger at Us Weekly and says, 'Nana nana boo-boo.' Yes, our heads hurt too," writes Sarah Hall of E! News.
Vaughn and Aniston have been hesitant to talk about their relationship until earlier this summer when they were promoting their movie, "The Break-Up."
After making coy references to the relationship in an interview with David Letterman in early May, Vaughn opened up a bit more to Oprah Winfrey a few days later.
"Jennifer's great," Vaughn told Winfrey. "She's just really smart and funny and easy to be with - very considerate. She's great. I think (having children) takes a lot of focus, takes a lot of attention. I think it would be nice at some point to have a different priority. I think that time would come. But not any time in the near future for me.
"No, I have not talked about having kids with Jennifer," he said, laughing. "First we have to have the $8 million wedding."