David - who will be standing in on 19 and 26 July - said: "I've done some presenting before and am still a bit nervous, but I'm really looking forward to it.
David will be standing in for Simon Grant
"Dressing up as Scooby Doo last time was such a laugh and I'm sure the show will have more of that sort of thing in store for me."
Loads of stars will be popping in during David's go at presenting, including Mark Owen, ex S Club star Jon, Craig David and Daniel Bedingfield.
David won't be the Fame Academy champ for much longer, because the new series of the show will be on the TV.
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