Just days after David Bowie's passing [1], the world has lost another great entertainer, Alan Rickman [2]. The iconic actor, globally famous for his role as Professor Snape in the Harry Potter [3] films, tragically lost his battle with cancer [4] on Jan. 14, and Hollywood is in mourning [5]. From his Dogma costar Salma Hayek [6] to Jane the Virgin's Gina Rodriguez, celebrities — along with every Harry Potter fan [7], ever —  are grieving on social media, proving that Alan had an everlasting effect on us and will truly be missed. Keep scrolling to see the reactions to the heartbreaking news, and then see how the cast of Harry Potter is reacting to the news [8].