Published Tuesday, 26 August 2014
The star's girlfriend, A.J Azari, gave birth to the couple's first child, whose name has yet to be revealed, over the weekend.
Announcing the news on his Twitter page on Tuesday, Williams wrote: "I watched in awe as @AJAzari gave birth to our 1st born son on Sunday 24th at 1.49am. He is my Treasure of life (sic)!"
The couple announced Azari's pregnancy in July.
Williams' ex-bandmate Marvin Humes was among the first to wish the proud parents his best, tweeting: "Huge congrats to @Oritse and @AJAzari on the birth of their baby boy! Can't wait to meet Williams Jnr! Big love guys".