Caitlyn Jenner has set a new Twitter record after gaining more than a million followers in four hours, Guinness World Records has confirmed.

Bruce Jenner as a woman has beaten President Barack Obama, who held the title for two weeks.

Barack Obama reached the one million mark in five hours.

Caitlyn Jenner launched her Twitter account at the same time as a Vanity Fair magazine cover was released, showing former Olympian Bruce Jenner as a transgender woman and revealing the name she will now be using.

She tweeted: “Another Jenner world record, and at 65? Who’da thought! Humbled & honored to have reached 1M followers in 4 hrs. Thank you for your support.”

At the time of writing, Caitlyn Jenner had reached a total of 1.8 million followers, although that figure is still rising.

Guinness World Records tweeted: “4 hrs and 3 mins! @Caitlyn_Jenner just set a new record for fastest time to reach 1 million followers on @Twitter.”

The cover photograph, shot by Annie Leibovitz, is part of a wider special where Caitlyn Jenner talks about her gender transition and how her family’s reacted.

Stepdaughter Kim Kardashian has shared her support for Caitlyn Jenner, tweeting: “Caitlyn Jenner for Vanity Fair Annie Leibovitz! How beautiful! Be happy, be proud, live life YOUR way!”