These 15-year-old twins are the reigning queens of Musical.ly, the Generation Z app that was just bought for ~$1 billion

Matthias Nareyek/Getty

Lisa and Lena attend the New Faces Award Style 2017 at The Grand on November 15, 2017, in Berlin, Germany.




Lisa and Lena Mantler, 15-year-old twins from Germany, have one of the fastest-growing fan bases on the internet. You've probably never heard of them, but the teen in your life has.

The girls are the reigning queens of Musical.ly, the social-media app of choice for Generation Z. Teens record and post 15-second clips of themselves lip-syncing, dancing to popular music, and pulling stunts. The app launched in 2014 and has racked up over 200 million "musers."

In November, the startup behind Musical.ly was purchased in a deal valued up to $1 billion.

Here's how Lisa and Lena rose to stardom before their braces came off.