By Tim Masters
Entertainment correspondent, BBC News
Sandra Bullock charms the audience as she accepts her Razzie in Los Angeles
Sandra Bullock turned up at the Golden Raspberry Awards on Saturday to pick up the worst actress prize just one day before she is expected to win an Oscar.
Bullock, who won the Razzie for the comedy All About Steve, arrived with a trailer filled with DVDs of the film to give to the audience.
"Something tells me you all didn't watch the film because I wouldn't be here if you really, really watched it and understood what I was trying to say," she said.
Bullock is hotly tipped to be named best actress for her role in American football drama The Blind Side at the Academy Awards on Sunday.
The Razzie awards are held in Los Angeles just ahead of the Oscars to celebrate the direst films of the year. The last big star to turn up and claim her award was Halle Berry in 2005.
Bullock received a standing ovation when she arrived on the Razzies stage with the DVDs.
Bullock co-produced the comedy All About Steve, which made a profit
"Everyone gets a copy and this is the deal I'm going to make," she told the cheering crowd.
"I will show up next year if you promise to watch the movie and really consider if it was truly the worst performance. If you're willing to watch, I'll come back next year and give back the Razzie."
In All About Steve, Bullock plays Mary Horowitz, a socially awkward crossword compiler who turns stalker when she meets a local TV cameraman.
During the film she joins a group of protesters, gets hit by a tornado and falls down a mine shaft where she meets a deaf girl at the bottom - all while wearing a pair of shiny red boots.
Bullock also co-produced the film, which made a profit at the box office. Critics, however, gave it a panning.
In other prizes, the worst picture of 2009 went to Transformers: Revenge of the Fallen while John Travolta's film Battlefield Earth was named worst picture of the decade.
One of Battlefield Earth's screenwriters, JD Shapiro, also turned up to accept the award.
He said: "I especially want to thank the dozens and dozens of people who went to see the movie."
He then quoted a review from the New York Times which said: "Battlefield Earth is about the extinction of the human race, and after seeing this movie I'm all for it."
The Jonas Brothers were named worst actors for their 3D concert movie, while Bullock and Bradley Cooper won worst screen couple - also for All About Steve.
The Razzies were set up by copywriter and publicist John Wilson as the antithesis to the Oscars, and are voted for by members of the Golden Raspberry Award Foundation, which is open to anyone.
Asked about Bullock's performance at the Razzies, Wilson laughed: "It was much better than the one you're about to see on the DVD."