Kelly Clarkson kicked off her Las Vegas residency's first show with an apology to fans after postponing opening night last week: 'I'm so sorry. We can't help our bodies sometimes.'

Kelly Clarkson's Vegas Residency: Her Setlist, What She Wore and What It Was Like originally appeared on Parade. What doesn't kill you makes you stronger. That's what Kelly Clarkson belts out in her hit "Stronger," and boy does she mean it.

Kelly Clarkson offered an apology to fans after she abruptly canceled the first two nights of her Las Vegas residency: “We can’t help our bodies sometimes.”