NEW YORK (AFP) - Country superstar Carrie Underwood on Tuesday announced the birth of her first child with her husband, hockey player Mike Fisher.

Underwood released on Twitter a photograph of the hand of their son - Isaiah Michael Fisher - and said he was born last Friday.

"God has blessed us with an amazing gift!" she wrote.

Underwood in 2010 married Fisher, a Canadian hockey player now with the Nashville Predators.

Last month, a heavily pregnant Underwood was unable to travel to Los Angeles to accept the Grammy Award for Best Country Solo Performance for her gospel-tinged Something In The Water.

Underwood, 31, is known for her healthy lifestyle and is a longtime vegetarian.

The former American Idol winner became a vegan a couple of years ago but said that she reverted a bit during her pregnancy.

"Now I'm pregnant, it's like, I can't just order steamed broccoli. That's not going to cut it," she told CBS television's Entertainment Tonight last December.