Sonny Bill Williams announces he is to be a father again with his fourth child on the way!

All Blacks midfielder Sonny Bill Williams already has a reason to celebrate in Japan.

The 34-year-old is to be a father again!

Taking to social media, Williams revealed the exciting news he and his wife Alana Raffie are expecting their fourth child together.

"Sometimes I really don't think I deserve all the blessings I've received in my life. Alhumdulliah Alhumdulliah Alhumdulliah!! Love & blessings fam," he wrote alongside a photo of four All Blacks jerseys embroidered with the names of his three children and "baby #4".

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The practising Muslim has two daughters and a son with his Raffie, who he married in 2013.

The couple's first daughter Imaan was born in 2014, his second daughter, Aisha, was born in December 2016 followed by son Zaid last June.

Congratulations Sonny Bill and Alana!