Australian singer Kylie Minogue has vowed to challenge Pippa Middleton to a "bum-off" when she takes the stage for the Queen's Diamond Jubilee Concert.

The 44-year-old pop princess will be performing in front of Pippa, 28, whose shapely bottom has hit headlines last year when she wore the bridesmaids dress to the wedding of her sister, Kate to Prince William.

On the "Alan Carr's Chatty Man" show, the comic man Alan asked Kylie whether she would consider a "bum-off" with Pippa. "'I'm going to have to," Kylie replied. "I'll definitely have to be like 'Oh!' drop something and pick it up off the ground," she joked while bending over. Then, Alan Carr presented her with a vibrating bottom-toning machine in a bid to help her look her best ahead of the challenge.

"I can't tell you too much about the performance, but what I can say is that I am doing a medley," the singer shared as she spoke about her involvement with the concert. "I've had a rehearsal and I had a very terrified expression. It's really exciting. Nerves aside, I can't wait. I hope the Queen and Charles are fans," Kylie further added.

The pint-sized Australian singer also revealed the kinky black dress from her latest video "Timebomb" is from a sex shop. "No one knows where it's from but I'm going to tell you," she confided to Alan Carr. "It was about £15 from a sex shop. That one was off the mannequin," she further shared.

Despite her apprehensions, Kylie Minogue is somehow confident that she will steer clear of a wardrobe malfunction claiming her trusty boob-tape has not let her down in the past. "On Can't Get You Out Of My Head video, there was a lot of tit tape. It was strategically placed," the singer shared. "I'm sure I've come close many, many times, but - touch wood - it hasn't happened," she confirmed.

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