She's the most followed person EVER on the social media site.
Reaching 50 million followers over the weekend, Katy became the first person ever to reach that number of followers, making her not just the most followed celebrity, but the most followed Twitter user.
Before she reached the milestone, the "Roar" singer told E! News that having so many followers on Twitter is "terrifying."
"Sometimes I want to post pictures of like really stupid stuff and I'm like 'but I have such a responsibility,'" she joked.
A recent display of her social responsibility happened when Katy spoke out after the Maryland mall shooting in January.
"Is anyone else really sad about the constant stream of shootings and how normal it's becoming to see these headlines on a weekly basis? Scared to go to school? Scared to go to the mall? Scared to go to the movies? Me too," she wrote. "When will there be ACTUAL change? How many more?! You and I both know this is getting embarrassing...My heart goes out to ALL the victims & their families this week. I pray for change."
Would you want to have so many Twitter followers or is it too much pressure?