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Self-proclaimed introvert Kristen Stewart, 19, has been thrust into the limelight thanks to her role as Bella in the big-screen adaptation of Stephanie Meyer's cult-favorite book series, "Twilight." Stewart is pictured here with her vampire love Edward, played by Robert Pattinson.

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Kristen Stewart poses for a portrait in Beverly Hills last year.

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Kristen Stewart at the London premiere for "Twilight."

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Kristen Stewart smiles to fans while walking in the streets of Park City, Utah.

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The "Twilight" teen smiles on the red carpet.

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In Italy, Kristen Stewart films the final scene for the second installment of the "Twilight" saga, "New Moon," which hits theaters this weekend.

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Kristen Stewart as Bella and Robert Pattinson as her on-screen love, vampire Edward, pose close at the forefront of this promotional photo for "Twilight," which also features Edward's vampire family members Alice (Ashley Greene), Emmett (Kellan Lutz) and Rosalie Cullen (Nikki Reed).

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A casual Kristen Stewart attends a photocall for "New Moon" in Mexico City.

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A scene from "The Twilight Saga: New Moon."

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Kristen Stewart offers photogs a half-smile at the "New Moon" premiere in London.

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Kristen Stewart as Bella in a promotional photo for "New Moon."

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Kristen Stewart premieres "New Moon" in Madrid.

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Kristen Stewart talks to fans before a screening of "The Twilight Saga: New Moon" in Knoxville, Tenn.

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Kristen Stewart and her on-screen best friend and love interest Taylor Lautner, who plays werewolf Jacob in the film, pose together at a screening of the movie in Knoxville, Tenn.

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Kristen Stewart signs autographs for fans in Knoxville, Tenn.

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Rumored twosome Robert Pattinson and Kristen Stewart sneak a glance at each other while chatting up fans at a "New Moon" presentation in Munich, Germany.

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Kristen Stewart visits the "Today" show in NYC.

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Kristen Stewart at the US premiere for "New Moon" in Westwood, Calif.

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Kristen Stewart stops on the red carpet to pose with real-life friend Dakota Fanning, who co-stars with Stewart in "New Moon" and in the upcoming film "The Runaways."

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Making up the "Twilight" trio, Taylor Lautner and Robert Pattinson sandwich their mutual on-screen love Kristen Stewart at the after party for the US premiere of "The Twilight Saga: New Moon" at the Hammer Museum in LA.