Britain's singing sensation Susan Boyle reportedly turned down a dinner invitation with US president Barack Obama as she was too nervous to attend the event.

The 'Britain's Got Talent' contestant, popularly known as 'Hairy Angel', turned down the invitation for prestigious annual Correspondents Dinner which took place in Washington DC on Saturday night where US president Obama was guest of honour, British tabloid News of The World reported.

Obama reportedly became a Boyle fan after watching her performance on TV.

"She was shocked and thrilled by the invite - but it was all too much too soon for her so she said 'No'. She has been told president Obama has seen clips of her on TV and loved her singing and she is delighted," a source close to Boyle told the newspaper.

The 48-year-old singer who captured hearts around the world when she sang 'I Dreamed a Dream' from Les Miserables would have also rubbed shoulders with the rich and famous including Hollywood A-listers at the five-star Hilton Hotel.

"She knows she would have been incredibly nervous if she'd gone," said the source. "But her dream is to sing for president Obama one day. She loves him and thinks he is
already a terrific president," the source added.