1. Niall Horan Receives Birthday Love From 1D Bandmate Liam Payne

Niall Horan Receives Birthday Love From 1D Bandmate Liam Payne

Niall Horan Receives Birthday Love From 1D Bandmate Liam Payne

Today (Sep. 13) marks One Direction singer Niall Horan's 24th birthday, and fellow 1Der Liam Payne offered a heartfelt happy birthday tribute to him today on Twitter. 

"Look at us all grown up and stuff love ya man," Payne offered to his bandmate, who he currently sits back-to-back with in the top 20 of the Billboard Hot 100 -- with his own Quavo-featuring "Strip That Down" sitting at No. 14, and Horan's "Slow Hands" right behind it at No. 15.

Fellow former 1D members Harry Styles, Zayn Malik, and Louis Tomlinson have been busy working on and promoting their own endeavors. Following a successful solo debut, Styles made his acting debut in the World War II epic Dunkirk this summer. Malik just dropped a collaboration with Sia titled "Dusk Till Dawn" -- the second song released from his sophomore LP -- due out "in the next couple months." Tomlinson has released two solo singles from his upcoming debut album, and is "excited" for fans to hear his new music.

Birthday wishes between the band members since their split have been relatively sparse, so it shouldn't come as a huge shock that Liam is the only one thusfar who's publicly given Niall his well wishes. Speaking candidly with Us Weekly on Tuesday (Sep. 12), Zayn admitted that he and Harry "don't have much of a relationship" because they're all "growing as individual men," but they still regularly check in with each other.