The couple put on a romantic display for the audience after winning Best Kiss.
Kristen, 20, also picked up an award for Best Female Performance for her role as Bella Swan in the Twilight Saga.
And Rob, 24, grabbed Best Male Performance for his role as Edward Cullen.
Rob thanked Kristen and his parents in his acceptance speech.
Kristen told the audience that she knew everyone wanted to see them kiss.
Watch the video of the pair kissing
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