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Picture: Michael Wilson/The West Australian

Ironman champion turned businessman Grant Kenny is reportedly the "baby daddy" of radio presenter Fifi Box's unborn child.

According to New Idea, the baby news was a shock for both Kenny and Box, who reportedly met last December in Waikiki while attending a star-studded airline launch.

"Fifi and Grant were very surprised when they found out about the baby but have both welcomed the news with excitement," an insider told the magazine.

Kenny - who already has three adult children with his former wife, champion swimmer Lisa Curry - is based on the Sunshine Coast where he manages his business, while Box's radio commitments see her travel between Sydney and Melbourne.

It is not known if either will relocate once the baby is born, which is expected to be in April.