On the night of her wedding to Edward Cullen, Bella Swan is visited by her friend Jacob Black. When Bella accidentally indicates to him that she and Edward plan to consummate their marriage during their honeymoon, Jacob tries to attack Edward but members of his wolf pack hold him back. He then runs off into the woods, and Edward takes an upset Bella back to the reception.
The couple spends their honeymoon on a private island in Brazil. Although hesitant, Edward has sex with Bella for the first time. After Edward realizes that he bruised Bella's arm, back and shoulders during sex, he says that he will never have sex with her again, much to her disappointment; he later gives in to her seductions. Two weeks into their honeymoon, Bella discovers that she is pregnant with a fetus growing at an extraordinarily accelerated rate, and they rush back to Forks. Bella refuses to heed the urging from most of the Cullens for her to have an abortion, and enlists Rosalie to protect her wishes.
Opposed to Sam Uley's plans to kill Bella and her child, Jacob leaves the pack in protest and arrives at the Cullen house to protect Bella; Seth and Leah Clearwater join him. As the pregnancy progresses, Bella's health severely detoriates. As a last resort, she begins drinking blood, which satisfies the fetus and allows her to regain some strength. Soon afterward Bella goes into a very painful labor and gives birth to her daughter, Renesmee. To save her life by turning her into a vampire, Edward injects Bella's heart with his venom, but nothing happens, and Bella is thought to be dead. Greatly distraught, Jacob attempts to kill the baby, but stops when he realizes he has imprinted on the child.
When the werewolves learn of Bella's death, they attack the Cullen house to try to kill the baby. They stop when they learn of Jacob's imprinting of Renesmee, which, under werewolf law, means Renesmee cannot be harmed. Bella's wounds heal and she wakes up with red eyes as a new-born vampire.
Kristen Stewart as Bella Swan
Robert Pattinson as Edward Cullen
Taylor Lautner as Jacob Black