Baby celebrations are under way for former All Black Ali Williams and wife Casey Green.

The proud new parents have taken to social media tonight to announce the safe arrival of their second child - Claudia Alexandra Williams.

The couple, who already have a three-year-old daughter called Jessica, have been living overseas since late 2013 with Williams working on his post-rugby broadcasting career.

Claudia Alexandra Williams has arrived into this world safely and is now home sweet home 💞 #totallyinlove #proudparents

A post shared by C a s e y G r e e n (@casey__green) on

"Claudia Alexandra Williams has arrived into this world safely and is now home sweet home #totallyinlove #proudparents," Green posted on Instagram, with a picture of Williams carrying the new arrival through the corridor of a London hospital.

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One of the first people to congratulate the happy couple was Amber Vito, wife of All Black Victor - who themselves welcomed a baby boy this month. "Aww gorgeous Hun!! Big congrats and love from us," she said.

Williams, 35, was part of the All Blacks' Rugby World Cup-winning side of 2011 and retired from international duty two years later.