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Bella crosses over to the realm of the undead "without a hitch," reveals her Breaking Dawn: Part 2 co-star Robert Pattinson.

In the final installment of the Twilight Saga series, fans will see the once-shy lady love of Rpatz's Edward transformed into a sleek, confidently fang-tastic goddess.

Related: ET's Twilight Tip of the Day

"The only worry is...how she's going to behave as a vampire," explains Robert of the highly-anticipated scene. "We find out very rapidly that she's very much in control of herself...hopefully it's going to be a powerful moment."

Watch the video to hear more from Robert Pattinson about Bella's big change.

Video: Watch Rob and Kristen Kiss in New 'Twilight' Promo!

Breaking Dawn: Part 2 hits theaters November 16.

Photo: Robert Pattinson and Kristen Stewart's Halloween Costumes