[Firewire]

Ciara has spoken out about supporting Britney Spears on her current world tour, insisting that the singer was a "sweetheart" to work with.

The 'Work' star opened for Spears on her British dates and recently confirmed that she would join the 'Womanizer' singer on the road again for her second tour of the US which kicks off in August.

Speaking to Rap-Up, she said: "I did a few days with her in the UK and that turned into us doing all these dates coming up, so I'm excited about it. The first time she came by, she was like, 'Hey Ciara! I just want you to know your show is great'.

"Backstage, it was really quiet, serene. It was just a cool vibe for women. We need to support each other and have good, positive energy around each other. That's what it was."

Ciara previously admitted that she had struggled with some of her performances during Spears's tour of the UK because she was suffering from a cold.