'Gangnam Style' singer's 2nd song crosses 1bn YouTube views

'Gentleman', the second single of 'Gangnam Style' singer Psy, has got over 1 billion views on YouTube. The 2013 single is Psy's second song which has crossed the 1 billion mark, after his 2012 track 'Gangnam Style'. 'Gentleman', which was leaked a day before its official international release, was the most viewed music video of 2013 on YouTube.