FLUFF: Beautiful baby boy for an Australian sports hero.

Giaan Rooney just gave birth to a baby boy… and announced his arrival into the world via Twitter.

The 31-year-old former Olympic swimmer / TV presenter gave birth to her first child with husband Sam Levett.

Giaan announced her pregnancy back in September, when she revealed that Sam’s always wanted to be a papa: “Sam has probably wanted to be a dad since he was about 15, and he’s absolutely beside himself,” she told News Corp.

“For me, I always knew it would happen, but I guess I really needed to be in the right time and right space. We are very fortunate and we are ready for it to happen,” she added.

And it just happened. Congratulations to Giaan, Sam and little baby Zander Samuel.

If you’re feeling clucky, here are some more beautiful celebrity babies…

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