Last Friday was Jimmy Fallon's 40th birthday and he got a big surprise on the set of the Tonight Show.

He started the show by thanking everyone for wishing him a happy birthday and announcing that the crew at the Tonight Show had gotten him a very special birthday surprise.

That's when they rolled out a giant birthday cake, which just so happened to contain a pair of special, and topless, guest hiding inside.

Who popped out of the cake you ask? Well you'll have to check out the video above to find out. They weren't even the real surprise though.

Keep watching for a special musical rendition of the "Happy Birthday Song" by one legendary artist which took Fallon completely by surprise.

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