He went right down to the judges table for the magic. Collin had Heidi Klum and Mel B both write on a different playing card and then he put them together. The girls then each had to hold the cards in their mouths really close together. It looked like they were about to kiss, but of course they didn't.
When they pulled the cards out of their mouths, there was only one card there now instead of two. Collins Key explained that they fused together. It was obvious it was their cards because you could see where they wrote their names on it. So how did he make it work? Nobody could figure it out! You can watch his performance in this video here.
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