I Guess You Don’t Know

Ariana Grande and Hailee Steinfeld attended the Stand Up 2 Cancer Benefit concert in Los Angeles tonight, September 5. Ariana performed her song “My Everything” at the benefit.

Hailee was spotted working the telephone lines with Katie Couric. The fundraiser focuses on raising money for cancer research and was also attended by Reese Witherspoon, Jennifer Aniston and Jon Hamm.