Britain's Got Talent star Susan Boyle has sparked fears over her health after she was filmed looking emotional on US TV.

The singer, who was treated in the Priory earlier this year, is said to have broken down after performing on The Today Show in New York.

In the Access Hollywood video, an upset-looking Boyle, 48, can be seen with her head in her hands.

A source told the Daily Mirror: "Everyone around her is acutely aware how susceptible she is to becoming emotional when under stress.

“She has just undertaken a tour of America, which would put anyone under enormous pressure.

"It seems to have taken its toll and she was visibly upset. She is being closely monitored and given all the support she needs."

Boyle was treated for exhaustion in May after coming runner-up on Britain's Got Talent.

The Scot became an overnight singing sensation on the programme. Her debut album, I Dreamed A Dream, was released on Monday.

The Rise of Susan Boyle