Liam Payne'sgirlfriendKate Cassidyis speaking out on what would've been his 32nd birthday. The girlfriend of the One Direction star– who died in October –posted a tribute Friday, Aug. 29, on Instagramabout the ex-"X Factor" sensation, addressing the note to "my dearest Liam." "It breaks my heart being that I can't hand you a physical birthday card today. That I can't hear your laugh, or tell you all the things I wish I'd said a thousand more times," Cassidy wrote. "I've been struggling to find the right words, but I'll start with the most obvious, happy birthday." She continued: "Today, you would have been 32. In your 31 years here on this earth you brought so much joy, happiness and hope to so many- especially to me. I hope you know how brightly you still shine, even from up there." View this post on Instagram A post shared by Kate Cassidy (@kateecass)