Sonny Bill Williams welcomes new daughter

Rugby superstar Sonny Bill Williams and wife Alana Raffie have welcomed their second daughter into the world.

Rugby superstar Sonny Bill Williams has welcomed his second child into the world. (AAP)

Rugby superstar Sonny Bill Williams has welcomed his second child into the world.

The All Black tweeted a picture of himself and his second daughter on Sunday morning, with a message saying she was a healthy girl.

He and his wife, Alana Raffie, have named their new daughter Aisha, a sister to Imaan, who was born in 2014.

"Aisha Williams, our gift from the most high came into this world struggling, but alhamdulillah after a long night she's improving," he said.