For the third year in a row, the vampire romance was named best movie at the light-hearted - and frequently X-rated - salute to Hollywood's biggest crowd-pleasers.
The Twilight Saga: Eclipse, which led the field with eight nominations, ended up with five awards. In a replay from last year Robert Pattinson and Kristen Stewart won for best male and female performance, respectively.
The real-life couple won the award for best kiss, which Pattinson celebrated by running into the audience to smooch his co-star Taylor Lautner.
Pattinson won an additional prize forbest fight - sharing the tub of gold popcorn with Bryce Dallas Howard and Xavier Samuel.
With categories such as those, nobody would ever confuse the MTV event with the self-congratulatory Academy Awards. The real point of the show is to promote upcoming buzzworthy movies targeted at MTV's youthful demographic.
Indeed a sneak preview screened of the fourth Twilight film, Breaking Dawn, Part 1, which opens November 18. Other exclusive clips were shown of the supernatural thriller Super8, which opens Friday, and Harry Potter and the Deathly Hallows Part 2, which opens July 15.
The awards are determined by fans' online votes, which probably accounts for Justin Bieber's win in the best jawdropping moment category for his 3D concert film Never Say Never.
The Canadian teen idol beat seemingly edgier scenes from such films as Black Swan and 127 Hours.
The producers of The Social Network probably will not lose too much sleep wondering why Aaron Sorkin's Oscar-winning script lost the best line from a movie category to the critical bomb Grown Ups.
The winning quote, "I want to get chocolate wasted," was uttered by child actress Alexys Nycole Sanchez.
List of winners at MTV Movie Awards
Following is a complete list of winners at the 20th annual MTV Movie Awards, held on Sunday at the Gibson Amphitheatre near Hollywood. The Twilight Saga: Eclipse, which led the field with eight nominations, ended up with five awards.
Best movie: The Twilight Saga: Eclipse
Best male performance: Robert Pattinson, The Twilight
Saga: Eclipse
Best female performance: Kristen Stewart, The Twilight
Saga: Eclipse
Best kiss: Kristen Stewart and Robert Pattinson, The
Twilight Saga: Eclipse
Best fight: Robert Pattinson vs Bryce Dallas Howard and
Xavier Samuel, The Twilight Saga: Eclipse
Best breakout star: Chloe Grace Moretz, Kick-Ass
Best comedic performance: Emma Stone, Easy A
Best line from a movie: Alexys Nycole Sanchez, "I want to
get chocolate wasted" (from Grown Ups)
Best villain: Tom Felton, Harry Potter and the Deathly
Hallows: Part 1
Best jaw dropping moment: Justin Bieber, Never Say Never
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