Camila Cabello, Bruno Mars, Ed Sheeran & More to Perform at 2017 Billboard Music Awards

- this year's billboard music awards are looking to be the most star-studded yet
- the first round of performers was announced monday, including ontd fave karla, bruno mars, celine dion, ed sheeran, lorde and many more
- the billboard music awards will air may 21 at 8 p.m. et on abc