"Happy birthday to cheeky, charming @Caradelevingne- who lights up my life..and regularly steals my phone & does this," the 25-year-old singer wrote.
The accompanying post is a screengrab from Taylor's phone, showing a string of cleavage photos
Cara snapped when she stumbled upon Taylor's phone when it was unattended.
But it wasn’t just Taylor who posted sweet a b-day message for the Suicide Squad actress -- her superstar friends Miley Cyrus, Gigi Hadid and Hailee Steinfeld also shared warm wishes online.
Miley shared a pic of the two friends licking each other's tongues with the caption, "Happpppy Biiiiiirffffffday Mushy!!!!!"
Gigi, meanwhile, shared a few adorable flashback Polaroids, which she captioned, "Found these today & ITS MY C BABY's BIRTHDAY!!!!!!!!! I love you!"
As for Hailee, it turns out she and Cara have a deep bond. The Pitch Perfect 2 star tweeted at Cara, "HAPPY BIRTHDAY to my spirit animal."