Rapper WILL.I.AM has revealed the scariest moment of his career - pitching his idea for a phone accessories range to bosses at tech giant Apple.

The Black Eyed Peas star has performed in sold-out arenas, taken part in the high-profile celebrations for Queen Elizabeth II's Diamond Jubilee earlier this year (12), and was a star turn at President Barack Obama's inauguration in 2009.

But despite overcoming stage fright on numerous big occasions, the I Gotta Feeling hitmaker admits he has never been more nervous than when he was called to a meeting with Apple bosses to discuss his new business proposal.

He tells British magazine ST, "I hadn't had 'cotton mouth' for ever. I have performed at the Queen's Jubilee, Obama's inauguration, the Super Bowl, World Cup, all of it, and not been nervous. At my Apple meeting, I felt like I had just swallowed a desert."

The rapper is launching a new range of accessories for Apple's iPhone, dubbed i.am+, which will include a camera-enhancing gadget.