It is a truth universally acknowledged that on your birthday, your best friend must post a cheesy, heartfelt photo collage dedicated to you on Instagram. Thankfully for the members of Taylor Swift's squad [1], the megastar and fashion designer [2] is well aware of this rule and posted an adorable message for her pal and "Bad Blood" video [3] alum Lily Aldridge's 30th birthday. The post is full of sweet snapshots of the friends holding Lily's daughter, Dixie Pearl Followill, followed by the caption: "Happy birthday to a mommy who lets her little girl dress like a princess whenever she wants, and makes balancing a million things look effortless and fun. I'm so glad you invited me to a Kings of Leon concert 6 years ago. My life would be unrecognizable without you, @lilyaldridge."

The Victoria's Secret model [4] is married to Kings of Leon frontman Caleb Followill and frequently posts cute photos of her adorable family [5] to Instagram. Happy birthday, Lily!