Jenner reveals new name Caitlyn, breaks Twitter record

Former Olympic athlete and reality TV star Bruce Jenner, who is transitioning to life as a woman, revealed her new name as Caitlyn Jenner on Monday and posed in a white strapless leotard on the cover of Vanity Fair magazine.

In a video on the magazine's website, Jenner said the cover, which features the headline "Call me Caitlyn," represents a liberating phase of her transition.

"Bruce always had to tell a lie," Jenner said. "Caitlyn doesn't have any secrets. As soon as the Vanity Fair cover comes out, I'm free."

Jenner launched a new Twitter account on Monday as @Caitlyn_Jenner, saying "I'm so happy after such a long struggle to be living my true self. Welcome to the world Caitlyn."

It became the fastest account to reach 1 million followers in four hours and three minutes according to Guinness World Records, besting U.S. President Barack Obama's verified @POTUS account that reached 1 million followers in five hours last month.

Vanity Fair launched the hashtag #CallMeCaitlyn, spurring a wave of positive messages about Jenner who broke records in the decathlon nearly 40 years ago.

Kim Kardashian, Jenner's stepdaughter, voiced admiration over the Vanity Fair photographs, tweeting "How beautiful! Be happy, be proud, live life YOUR way!"