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Updated: Wed, 15 May 2013 16:15:00 GMT | By Colleen Last
Day and night: TV stars on and off-duty

Demi Lovato and Simon Cowell

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It's the time of year when American stars get glammed up to promote the new seasons of their TV shows.

We compare their red carpet looks to their on-air personas, including X Factor judges Demi Lovato and Simon Cowell, who dressed casually for the New York photo call...