Simon Cowell has revealed what his favourite Fifth Harmony song is.

The girl group are nestled under the music mogul's wing after coming third on the US X Factor in 2012.

The quintet released their debut album 'Reflection' in early February and Cowell told Perez Hilton about his favourite track by the group.

He said: "I think probably the Mariah song [is my favourite song on the album], I think it's really clever. And I only read today that Mariah tweeted about it and that she loves it.

Cowell added that he was "very happy" about Fifth Harmony because they were able to be moulded into a successful group in the "real world".

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Watch Cowell talk about Fifth Harmony below: