Jenner filed paperwork with the court on September 15 requesting the change after her transition as a transgender woman.
She asked her name be legally changed to Caitlyn Marie Jenner and her gender be made female.
The petition has been granted, Los Angeles Superior Court spokeswoman Liz Martinez said Friday. It means her new name now replaces her birth name of William Bruce Jenner.
Jenner, a former Olympic gold medalist and star of “Keeping Up with the Kardashians,” made headlines this year after months of rumors about gender-reassignment surgery and her changing appearance.
After publicly confirming the transition in a TV special with Diane Sawyer, she went on to debut her name and look on the cover of the July Vanity Fair issue. Her journey captured the attention of millions.
The same month, Jenner accepted the Arthur Ashe Courage Award at the ESPYs.
“If you want to call me names, make jokes, doubt my intentions, go ahead. Because the reality is, I can take it. But for the thousands of kids out there coming to terms with being true to who they are, they shouldn’t have to take it,” she said.
Jenner stars in the E! series “I Am Cait,” where she documents her transition.
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