LOS ANGELES ? Sandra Bullock was crowned top of the flops at the 30th Razzie Awards here Saturday, the annual eve-of-Oscars spoof, which pays homage to the very worst of Hollywood.

Bullock, who could complete an unprecedented double on Sunday if she wins a best actress Oscar for her performance in "The Blind Side,? delighted guests at Los Angeles's Barnsdall Theater by appearing to collect her award.

The 45-year-old also handed out DVD copies of her offending performance in the box office flop "All About Steve" to guests.

"I'll show up again next year if you promise to watch the movie and really consider if it was the worst performance of the year," said Bullock after receiving her "Razzie," a plastic gold spray painted raspberry.

"And if it isn't, I'll give back the Razzie," added Bullock, revealing that she had cut out of a charity dinner with Hollywood powerbroker and producer Jeffrey Katzenberg to attend the awards.

"Now I've got to get back to that event, because you know, it's Jeffrey Katzenberg and he can basically prevent me from ever working again," Bullock quipped.

Bullock also picked up a Razzie for worst screen couple in partnership with "All About Steve" co-star Bradley Cooper.

It was the first time a worst actress recipient had appeared in person to collect their Razzie since 2005, when Halle Berry walked off with the award for her performance in "Catwoman."

Elsewhere Saturday, the Razzies were spread across several films although the big winner was "Transformers: Revenge of the Fallen," ridiculed as "overlong, over-loud and underwhelming."

The film earned a worst director Razzie for Michael Bay as well as worst screenplay and worst picture.

Worst actor was awarded to Disney boy band the Jonas Brothers for their performance in "Jonas Brothers: The 3-D Concert Experience."

Worst supporting actor Razzies went to Billy Ray Cyrus for his part in "Hannah Montana: The Movie" and Sienna Miller for her part in the action film "G.I. Joe: The Rise of Cobra."

To mark the 30th edition of the Razzies, first held in 1980, organizers also revealed their worst under-achievers of the past decade.

John Travolta's much-lampooned Scientology-based sci-fi flick "Battlefield Earth" was crowned worst picture of the decade, while Eddie Murphy was named worst actor for a string of duds which included "Norbit" and "Meet Dave."

Socialite Paris Hilton was named worst actress for her box office flops "The Hottie and the Nottie," "House of Wax," and "Repo: The Genetic Opera."