LL Cool J tells Obama how to run the U.S.

And you thought LL had retired from dishing out his words of wisdom!Rapper LL Cool J has penned an open letter to new US President Barack Obama, offering him words of advice about how best to serve his country.

The hip-hop star was an outspoken supporter of the Democrat on the campaign trail, and he is delighted to have played a part in such an important election.

LL, real name James Todd Smith, has urged Obama to stick to his principles as he embarks upon an historic journey.

"The next chapter of your life has begun," he wrote. "The toughest decisions you will ever have to make lie in front of you. Decisions that will require you to choose between integrity and necessity to enact the promises made to millions of people, and recognise a change in perspective that will sometimes make those promises impossible to keep.

"Only you will be able to make those choices.

"You have shifted the cultural paradigm of America, but now you have to live up to the ideal that fostered the shift and ensure that the paradigm doesn't shift back. You must deliver."