United Kingdom, July 14 -- Kelly Clarkson cried after cancelling the opening night of her Las Vegas residency.

The 43-year-old pop star was forced to cancel the opening night of her residency at The Colosseum at Caesars Palace after falling ill, and Kelly actually apologised to her fans after taking to the stage this weekend.

She told the crowd: "It took me a minute. I'm so sorry.

"I know some of y'all had tickets for last weekend's shows. I'm so sorry. We can't help our bodies sometimes. You know, we get sick, and that happens.

"But thank y'all for showing up. We are so excited. This is my favourite residency - my favourite show I've ever put together, because I love being in the studio."

Kelly subsequently revealed that she was red...