Radio host Fifi Box has confirmed that former ironman Grant Kenny is the father of her daughter Trixie.

Box, who co-hosts Fifi and Dave on Fox FM, had been silent on the subject of paternal identity until giving the game away in two Instagram posts of Kenny and three-year-old Trixie on Monday.

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The images showed Kenny and Trixie playing together in a jumping castle. One image had the caption, “Bouncing castle daddy cuddles”.

It is believed Kenny and Box split up in 2012 – immediately before Box announced her pregnancy. She never publicly confirmed Kenny as the father, although it was a known secret within the industry.

Shortly after the birth of Trixie, Kenny’s son Jett posted an image to Instagram of himself holding his baby half-sister, while Kenny’s daughter Jaimi has posted images of herself babysitting Trixie.

Despite the speculation, Box has always maintained she didn’t need to bow down to the pressure to confirm Kenny as the father.

“I honestly don’t give a second thought to the laughable tales of fiction printed about my personal life,” Box told The Daily Telegraph last year.

“I’m too busy being a working mum to focus on anything other than my precious little girl. She means the world to me and I’m doing all I can to protect her and ensure she has a happy, stress-free, easy path in life, just what any parent wants for their child.”

Kenny, who has three other children with former Olympian Lisa Curry, won a bronze medal in the 1984 Olympics for canoeing.

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Box and her daughter play with Kenny in the backyard. Photo: Instagram