Candace Bushnell has reason to celebrate: Her latest series, “The Carrie Diaries,” has been picked up by the CW, and her divorce from ballet dancer Charles Askegard has been finalized. Sources say Bushnell’s friends are now planning to throw the “Sex and the City” creator a blowout “divorce party.” They further add that despite a tense split, Bushnell and her ex are moving on amicably. “It’s sad, but we hope to remain friends,” Bushnell wrote in February in a newsletter to pals.