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  1. ITV Report

Crying baby is instantly cheered up by Katy Perry song

The video has been viewed nearly 1.5 million times. Credit: YouTube/Eva Barker

Parents looking for tips on how to stop their baby crying may be able to use one mother's secret - the sound of Katy Perry.

The crying little girl instantly smiles when she hears the sound of Perry's Dark Horse track on the radio.

The baby waves her arms and nods her head in approval during the video which has been viewed nearly 1.5 million times on YouTube.