Robbie Williams' troubling sex joke with 15-year-old fan

The moment Robbie Williams discovers his joke could land him in trouble. Photo / YouTube

Robbie Williams has courted controversy at a recent concert by making a sexy joke to a 15-year-old.

Williams was performing in Brisbane when he found out a fan in the front row called Morgan was celebrating her birthday.

The pop star, due to perform in New Zealand on Tuesday night, then complimented Morgan on her "secretary looks".

"I love that look. I love the look with the glasses and the hair," Williams said.

"It's like the secretary look. Which reminds me, I've got to clear my browsing history on my computer before Ayda (Field, Williams' wife) sees it."

Williams then asked Morgan how old she was - only to discover that she was celebrating her 15th birthday.

"Oh shit, that joke just ..." Williams said, trailing off before pleading with fans to refrain from putting the video on YouTube.

"It'll be on YouTube, and then it'll be in the newspapers, and then I'll get arrested."

Williams dedicated his next song, She's the One, to Morgan and her mother, then offered her some life advice.

"How do you dig yourself out of that one? Stay away from boys like me Morgan."

- nzherald.co.nz