Robbie Williams was left red faced during his recent Brisbane concert after he was caught on video flirting with a fan in the crowd only to realise that she was only 15.

Robbie Williams
Robbie Williams 

Robbie is known for stopping his shows to chat with his fans in between songs, and in this particular instance, one girl caught his eye. The heartthrob complimented her hair and glasses. The singer said, "I love the secretary look, which reminds me, I really do need to clear my browsing history."

Robbie then asked the fan how old she was, and was stunned when she revealed that she just turned 15. "Fifteen? Oh sh*t!” Robbie exclaimed, and then turned to the stadium with his fans holding up their camera phones: “Don’t put that up on Youtube!"

The video, which has gone viral, shows Robbie asking if the fan was accompanied by her mother, before introducing himself as 'Uncle Rob' — in what was perhaps one of the most cringeworthy moments of his life.

Deciding to give up and get on with the show, Rob concluded the embarrassing segment by dedicating 'She's The One’ to the teen and telling her, "If you can suspend disbelief for a bit and pretend I’m not 41, this one’s for you."