Robbie Williams showed you can sing when you’re bidding as he made his debut as an auctioneer.

Fans were left star-struck when the 41-year-old star made a surprise appearance while 150 of his personal items went under the hammer for charity at Bonhams in central London.

Taking bids in front of his wife Ayda Field and father Pete Conway, he sold off a set of handwritten lyrics to his duet with Kylie Minogue Kids for £5,500 minus fees.

Williams told the auction room: “It’s just a set of handwritten lyrics for the popular song from last century Kids Robbie Williams featuring Kylie Minogue, and she is very fit and still is.”

Bidders were left in stitches after the Angels singer got distracted when fan Barbara Veras, 26, a doctor from Sao Paulo in Brazil, entered a bid.

He told her: “Haven’t I kissed you during a gig? Are you Barbara, is your name Barbara? Nice to see you again, you normally wear really red lipstick and are at the front of the shows. It’s nice to meet you, glad we’ve had a chat now because we kissed first and now we’re chatting.”

Handing over the gavel to Williams before the bidding began, Bonhams auctioneer James Stratton said: “I’ve never lent this to anyone else, but here you go.”

All proceeds from the sale, called Doing It for the Kids, will go to the Donna Louise Children’s Hospice in Stoke-on-Trent, of which Williams is a patron.

The most expensive bid of the day was £25,000 minus fees, made over the phone for the handwritten lyrics to Williams’s 2013 track Go Gentle.

The auction raised £145,000, with an MTV Award selling for £10,625 and a cream two-piece suit Williams wore for music video Radio going for £5,250.

The singer, who took time between tour dates to come to London for the auction before flying to Bucharest in Romania for a gig, signed autographs for fans as he left through a back door.