The 22-year-old was named Favourite Movie Actress for her role in 'The Twilight Saga: Breaking Dawn - Part 2', and she also picked up the Favourite Female Buttkicker trophy for 'Snow White and the Huntsman', reported MTV.
Stewart received the honours from award presenters Sandra Bullock and Neil Patrick Harris. One Direction missed the ceremony as they were performing at a concert in Birmingham, England, but they were named Favourite Music Group and also landed Favourite Song for What Makes You Beautiful.
In other music categories, teen sensation Justin Bieber bagged the Favourite Male Singer accolade, while pop star Katy Perry picked up the female equivalent. Rapper Pitbull's performance with Christina Aguilera kicked off the Los Angeles prize giving, which was hosted by actor Josh Duhamel.
Mumbai Roundup: 9 incidents that took place this week
Photos: Ajay Devgn, Parineeti, Tabu at 'Golmaal Again' trailer launch
Photos: Dipika Pallikal Karthik oozes oomph in bikinis and sarees
Photos: Kareena Kapoor Khan's grand birthday bash
Photos: 'Dangal' girls Sanya Malhotra, Fatima Sana Shaikh's dinner outing