Birth Name: Brianna Caitlin Hildebrand
Date of Birth: August 14, 1996
Place of Birth: College Station, Texas, USA
Height: 5′ 3″ (1,6 m)

From IMDB:

Brianna Hildebrand was born on August 14, 1996 in College Station, Texas, USA as Brianna Caitlin Hildebrand. She is an actress and producer, known for Deadpool (2016), Deadpool 2 (2018) and Tragedy Girls (2017).
She has Spanish, Native American and German ancestry.
She got her first guitar at the age of 12. Soon after, she started to write her own songs.