SOPHIE Monk has reportedly been locked in to keep Fifi Box's 2DayFM seat warm when she leaves to give birth.
Industry sources have revealed that the pop star-turned model has been lined up to fill in for the pregnant 2DayFM radio host in the coming months.
Fifi, who co-hosts with Jules Lund, announced last November that she was pregnant, saying it's the greatest thing to ever happen to her.
It emerged soon after that former champion Ironman Grant Kenny, 49, was the baby daddy.
A spokesperson for Southern Cross Austereo told news.com.au that "nothing has been locked in yet", but did say that Fifi wasn't planning on taking very much time off.
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