Cheryl Cole’s birthday banner for Simon Cowell

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Pop star Cheryl Cole has reportedly surprised music mogul Simon Cowell by flying a birthday banner over his Miami home.

The ‘Promise This’ singer, who is believed to have fallen out with the music mogul when he fired her from the US 'X Factor' earlier this year, hired a plane trailing a cheeky message over the property to celebrate Cowell's 52nd birthday, Femalefirst reported.

It read, "Simon Cowell is 52 today! Ha ha ha! Love Cheryl."

Cowell was said to have found the stunt "hilarious".

"Cheryl knows he likes to keep his birthday quiet so he thought it was very funny that she was teasing him over it. They had a strong friendship outside of work.

"The past couple of weeks they have been back in touch and there's no doubt they missed each other's friendship," a source said.