Zayn Malik has dyed his hair pink. The former One Direction singer - who has experimented with his look since quitting the boyband and previously rocked green, grey and blonde hair - unveiled his latest shade on Twitter. In the shirtless selfie, which puts his tattoos on display, Zayn's roots are his natural black but the rest of his hair is dark pink. Meanwhile, Zayn is on a professional high at the moment after debuting at number one on the Billboard Hot 100 chart. His first solo single 'Pillowtalk' also topped the On Demand Songs and U.S. Digital Songs chart and reached number one in his native UK following its January 29 release. Zayn said: "Thank you to all my fans and supporters. We have achieved this together and I am grateful." He also tweeted: "What is gwaning :) !! I can't explain the love and gratitude i feel today, thank you for making this happen (sic)." 'Pillowtalk' sold 267,000 downloads - the highest one-week sales of 2016 - and became the fastest song by a debut artist to reach number one on Spotify's global chart. It is also just the 25th song ever to debut on the top spot of the Hot 100. This is Zayn's first number one on the chart, he previously peaked at number two with One Direction's 2013 'Best Song Ever'.