The Grammy-winning singer will now kick things off in Las Vegas on Friday, July 11 Kelly Clarkson was forced to postpone her Las Vegas residency kickoff on July 4 to protect her voice A source tells PEOPLE the star "was devastated and felt terrible" after postponing her shows The source adds that Clarkson is "ready to kick things off this weekend" Kelly Clarkson’s decision to postpone the long-awaited opening of her Las Vegas residency was not an easy one.