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Kate and sister Pippa both feature on Dappy's new track.
For his first solo record 'No Regrets' Dappy sings about getting frisky with Prince William's missus Kate Middleton.
But by the sounds of things the hat-wearing rapper prefers Kate's sis Pippa.
"I'm a prince and yes, Will got the crown - Kate stays in my dungeon when her sister's round," he sings.
The singer is excited about his new solo career and he's determined to outshine his fellow UK rap artists like Tinie Tempah and Tinchy Stryder.
"I want to do better than them," Dappy told The Sun. "There's nothing wrong with aiming high."
"They are friends but also competitors and I want to be the best."
The N-Dubz singer will release his debut solo effort 'No Regrets' on Sunday 18th September.