A hacker hijacked the 3.5 million-follower Twitter account of Gary Barlow, the lead vocalist of the British pop group Take That and former X Factor UK judge. The hacker posted a tweet referencing the child Barlow and his wife lost back in 2012. The offensive message was quickly removed by the celebrity or by his team, but not before a lot of users saw it. So far, Barlow hasnt made any statement regarding the incident. The pop-star hasnt posted any messages on Twitter over…