The British royal is said to have been taking a mystery blonde woman on his Ducati 848 across Putney Bridge in South West London when he was pulled over, according to The Sun.
The officers soon apologised after they realised who he was, especially as he had reportedly not committed any offence.
"It must have been embarrassing for Harry - he was keen to impress, having decided to surprise her with a picnic," a source recalled.
"The officer said, 'Can you take your helmet off?' and Harry replied, 'I would rather not'. His minders stepped in and the officer said, 'I'm so sorry'."
The incident allegedly took place around six to eight months ago. The identity of the blonde woman has also not been disclosed.
Prince Harry has been romantically linked with The Saturdays singer Mollie King in recent months, while he was recently spotted flirting with Cheryl Cole.