The 20 year old Danish singer was propelled to international stardom six months ago with her performance of Only Teardrops at the Final in Malmö, Sweden.
De Forest said she was thrilled by the invitation and looked forward to performing on stage and meeting the twelve young contestants who will represent their home countries.
"In a little over two weeks, the world will change for three super talented entrants," she said. "I wish them the best luck for one extraordinary night of entertainment."
The Contest, which is open to contestants aged between ten and 15, will also feature performances from last year’s winner Anastasiya Petryk, co-host and this year's Eurovision Song Contest participant Zlata Ognevich, and the 2004 winner Ruslana.
EBU Head of TV Bettina Brinkmann says that interest in the coproduction, hosted by Ukrainian public broadcaster and EBU Member NTU, has been immense.
"There's a lot of buzz around the format changes we've made this year," said Ms Brinkmann. "As well as creating awards for first, second and third prize winners, the children will conduct their own draw for the running order. News that the winner will be given the opportunity to appear at the Eurovision Song Contest in Copenhagen is also generating immense excitement as far away as Australia.”
The two hour contest will be broadcast from the National Palace of Arts Ukraine and will be available to participating broadcasters live or via online media streams.