#RIPRobin became a trending topic as Directioners mourned along with Harry Styles after the death of his stepdad Robin Twist! According to the family's official statement, he passed away at 57 following a long battle with cancer.
Last June 3, Robin and Harry's mum Anne Cox celebrated their fourth wedding anniversary. The "Sign of the Times" singer served as the best man during their 2013 wedding.
Harry's fellow One Direction member Louis Tomlinson - who lost his mother Johannah last December - sent love via Twitter.
Meanwhile, Liam Payne and Niall Horan - who are currently battling Harry on the MYX charts - remembered Robin on Instagram.
Send your condolences to the Styles-Twist family in the comments!