The 28-year-old singer - who has admitted she was in an abusive relationship - spoke out before the ballad Remember That. The song features the lyrics: "It doesn't matter how he hurts you/With his hands or with his words/You don't deserve it." 

She told the crowd at the Cricket Wireless Pavilion that "In love, we all go through a lot of things, and a lot of things unfortunately make us stay there in the relationship. "No matter what you go through in life, no matter what abuse you go through, take your heart and run so far away." 

Although Simpson, who was wed to Nick Lachey and also dated John Mayer, has never named names, she admitted last year to Elle: "I have definitely experienced abuse in a way that I would tell people to take their heart and run."