Lucy Guo has amassed more wealth than Rihanna, Madonna and Beyonce, according to a new Forbes ranking, but you're far less likely to have heard of her.

Lucy Guo, a Carnegie Mellon dropout, has become the world's youngest self-made woman billionaire, surpassing Taylor Swift. Guo's wealth stems from her 5% stake in Scale AI, a data annotation firm valued at $1.

Guo, the daughter of Chinese immigrants, grew up in the San Francisco Bay Area and began learning to code while still in middle school.