Katy Perry has joined an array of high-profile celebrities in a video to encourage US citizens to register to vote in the upcoming Presidential elections.The hilarious clip, which sees Jane Fonda reprise her role as an at-home fitness instructor, sees high-profile celebrities including Ashley Benson, Shaq, Kerry Washington, Ken Jeong, Vanessa Hudgens, Amy Schumer and of course Katy's fiancé Orlando Bloom exercising in the 'Get Pumped To Vote' campaign.