The 24-year-old is slated to perform at the 2014 iHeartRadio Music Festival in Las Vegas on Friday.
The pop singer covers Roy Orbison's "It's Over" and Led Zeppelin's "Baby, I'm Gonna Leave You."
The 25-year-old attended the Point Foundation's Voices on Point Gala at the Hyatt Regency Century Plaza in Los Angeles and dropped the powerful cover on Sunday.
Jennifer Lawrence stars in the full-length trailer for the third film in the "Hunger Games" series.
The 21-year-old reflects on her early ambitions to become an R&B powerhouse and her first car accident in magazine's October issue.