Ant & Dec have revealed the news, but the new arrivals' identities remain a mystery to the 10 original campmates. Comedians Dom Joly and Jenny Eclair are expected to be unveiled as the new entrants tomorrow.
However, in a twist, the new celebrities will not enter the camp as normal. Instead, they will be allowed to reside in a residence called the Spook Hut for their first few days on site.
A source told DS: "Dom and Jenny will be joining the campers tomorrow. They will be forced to undertake an overnight challenge called The Shack.
"Producers did plan to put Dom Joly in with Alison Hammond, but they changed their minds at the last minute and opted for Jenny Eclair. The show's producers thought it would be more entertaining and comedic to have two comedians spending the night in The Shack."
Ex-Big Brother star Alison Hammond may still enter the jungle at a later stage.
I'm A Celebrity continues on Thursday at 8.30pm on ITV1.