Renee Zellweger, who played the lovelorn Brit in Bridget Jones's Diary, and country music star Kenny Chesney will have their four-month-old marriage annulled, Chesney's publicist, Holly Gleason, and Zellweger's Los Angeles-based publicist Nanci Ryder, said.
In court papers filed on Wednesday, Zellweger listed "fraud" as the reason for the break-up but did not elaborate.
A phone call to her attorney was not immediately returned, nor was a call to Gleason later in the day regarding the fraud claim.
People magazine and Entertainment Tonight first reported the break-up, which brings to an end a whirlwind romance that began shortly before a surprise wedding in May.
The 36-year-old actress and Chesney, 37, wed in a small ceremony on the Caribbean island of St. John in the US Virgin Islands. It was the first marriage for both.
Photos of the couple barefoot on the beach were widely distributed.
They first met at the Concert of Hope tsunami relief benefit on January 15, where Chesney was singing and Zellweger was answering telephones, the syndicated television news magazine The Insider had reported.
"I am incredibly happy," Chesney said at the time. "I may well be the luckiest man alive. To be so in love with someone who is so perfect for me. It's just hard to imagine that I'm not going to wake up."
Three days later, Chesney resumed his Somewhere in the Sun tour.
But by late July, reports were circulating that the newlyweds were splitting up.
Last week, Britain's Daily Mail estimated that Zellweger and Chesney had spent 15 days together since their wedding. Caught by the newspaper on the red carpet for the London premiere of Cinderella Man, Zellweger, who attended the event solo, batted away rumours of a marriage in swift decline.
"I'm happily married," Zellweger said, according to the paper, "but I don't talk about it because I want to keep my precious things precious."
Word of their pending annulment was first reported on Thursday afternoon by People magazine. Later, Los Angeles' City News Service dug up the filing, and the "fraud" declaration.
Zellweger, the titular singleton of the Bridget Jones movies, previously had been linked, but legally unattached, to the likes of White Stripes rocker Jack White, Jim Carrey and George Clooney.
Chesney is the Country Music Association entertainer of the year in November, while his When the Sun Goes Down was named album of the year. His hits include Me and You and She Thinks My Tractor's Sexy.
He will be part of an upcoming Country Music Television benefit concert for victims of Hurricane Katrina and his new album, The Road & the Radio, is due out November 8.
In the pantheon of short-lived Hollywood marriages, Zellweger and Chesney's four-month-long union lasted an eternity compared to those of Zsa Zsa Gabor (one day, in 1982) and Britney Spears (55 hours, in 2004).
Getting divorced just because you don't love a man is almost as silly as getting married just because you do.
I am a marvellous housekeeper. Every time I leave a man I keep his house.
Conrad Hilton was very generous to me in the divorce settlement. He gave me 5,000 Gideon Bibles.
Divorce is a game played by lawyers.
A lot of people have asked me how short I am. Since my last divorce, I think I'm about $100,000 short.
Like I said, I've got too much respect for women to marry them, but that doesn't mean you can't support them emotionally and financially.
My divorce came to me as a complete surprise. That's what happens when you haven't been home in 18 years.
You can't stay married in a situation where you are afraid to go to sleep in case your wife might cut your throat.