Liam:
"Happy birthday @Y/T/N! All I can think about is you right now. Thank you for being so supportive of everything I've done and thank you for being such a wonderful girlfriend! Love you so much! xx"
Louis:
"It's currently midnight back home, and it's literally 4 in the morning here. Happy birthday to my little pig @Y/T/N! Love you lots. Can't wait to come home this weekend and celebrate it with you! :)"
Niall:
"Today is the day you turn 19! We're the same age now...we are so old. Haha. Happy birthday princess @Y/T/N! I'm going to land soon. The other lads say happy birthday as well. Love you!!!"
Harry:
"Happy birthday to you! Happy birthday to you! Happy birthday dear @Y/T/N! Happy birthday to you! Happy birthday to the lovelist person in the universe! Can't wait to see your face when I give you my gift! ;)"
Zayn:
"Well well well. Look who's birthday it is! Happy birthday @Y/T/N! Today is the day we celebrate the day where you were brought to earth. I'm so thankful to have you in my life. I love you! :)"