Britain's Got Talent judge Piers Morgan has leapt to the defence of Susan Boyle after a number of exposive outbursts by the talent show favourite.

The self-proclaimed virgin-turned-global superstar has shown some worrying signs that she is struggling to cope with her newly-acquired fame over the past week.

As we reported yesterday, the singing sensation's volatile temper erupted in the bar of London's Wembley Plaza Hotel, where she and fellow guests were gathered to watch Tuesday evening's semi-final.

According to witnesses, Susan yelled "f*ck-off" and flicked a V-sign at the television screen after Piers heaped praise on her 12-year-old singing rival Shaheen Jafargholi.

Then on Wednesday she reportedly unleashed a foul-mouthed rant at two strangers in the lobby of the hotel.

Moment of calm: Susan waves to photographers outside her London hotel yesterday

But Piers has defended the under-pressure star, writing on his blog: "Susan is finding it very, very difficult to cope, and to stay calm.

"She has been in tears many times during the last few days, and even, fleetingly, felt like quitting the show altogether at one point and fleeing all the attention."

He continues: "Susan Boyle is a very kind, generous-hearted, lady who has had a pretty tough life. She was deprived of oxygen during her birth, and that left her with 'learning difficulties', causing her to be called 'Simple Susan' at school.

"But she's always, according to people who knew her well, been a fun-loving, popular woman who would do anything to help others, including devoting considerable unpaid time and effort to her local church and community as a volunteer.

"I'm not saying she's a saint. But I am saying that before all this fuss, Susan was generally considered by everyone who met her to be a genuinely lovely person. Albeit, one with a lively, feisty character, and a wonderfully eccentric sense of humour."