Liam at the Bellagio (1.8.2013.)

Harry in Cal's vine in Vegas

Keep tweeting: #MTVHottest One Direction

Niall and 5SOS, Las Vegas (1.8.2013.)

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Liam with his mum and dad earlier, Las Vegas (1.8.2013.)

Liam at Stratosphere (Casino, Hotel & Tower), Las Vegas (1.8.2013.)

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Harry with fans, Las Vegas (1.8.2013.)

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Louis and Eleanor, Las Vegas (1.8.2013.)

The world premiere of ''This Is Us'' will be in London on August 20th.

Liam at the pool in Vegas with Lux Tom Sam and Gemma