Los Angeles  - American rhythm and blues singer Toni Braxton, 40, has cancelled the rest of her two-year concert contract in gambling resort Las Vegas due to illness, the internet news service E! Online reported Friday.

The six-time Grammy winner was to have performed until August in Flamingo Casino-Hotel. Her health was more important, said the casino, where she has performed her "Toni Braxton: Revealed" show since August 2006.

Braxton started complaining of chest pains and was admitted to hospital in April. She has not performed since then.

Braxton has been treated for high blood pressure and heart problems in the past.

Her most famous hits include "Youre Makin Me High" and "Un-break My Heart". (dpa)