Katy Perry's Dark Horse cheers up crying baby

How do you stop a crying baby? Put on some Katy Perry and you'll have a happy toddler in no time. This was seen on a YouTube video where a baby's mood suddenly changes when Katy's Dark Horse begins.

The toddler is sitting in the back of a car and is crying, but the second the song comes on she stops crying. She smiles, waves her hands and nods her head.

So cute! Watch the video below.

*Picture: Elite