Reality TV
The duo will replace regular host Dermot O'Leary when the new series starts on E4 later this summer. Davina McCall is presenting the main Channel 4 show as normal.
Lamb and Ifore worked together on E4 Music and breakfast entertainment show Freshly Squeezed.
Speaking about his new role, Lamb said: "Imagine how excited someone would be if they were presenting Big Brother. Well I'm just a little bit less excited than that but I'm still extremely excited."
Ifore added: "This is preposterously good, I've always loved Big Brother - it's omnipresent, you can't help but get sucked in!
"And working alongside a lovely lamb too - George Lamb - ain't half bad either. Bring it on!"
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