Above: Kloss walks in the Victoria's Secret fashion show in December.
The in-demand model earned a reported million last year.
The second half of the night took place at 1920's-themed restaurant Delilah (by the same owners of The Nice Guy).
One-time Taylor Swift rivals Katy Perry and Calvin Harris released their collaboration track "Feels" late last night.
Harris could be alluding here to Swift's history of writing love songs and music inspired by her past boyfriends.
She's not afraid to catch feelings, express them, or pursue the real relationship she's looking for."Once I fell in love, or thought I was in love, and then experienced disappointment or it just not working out a few times, I realized there's this idea of happily ever after which in real life doesn't happen," There's no riding off into the sunset, because the camera always keeps rolling in real life.
How does an It girl/It model celebrate her 21st birthday? To start off the night on a (semi) low-key note, she and her closest friends had dinner at Catch LA in West Hollywood.
She attended in a decked-out catsuit by Julien Macdonald (brave attire for eating a meal, but then again, this They indulged in cocktails by Absolut Elyx and sushi before sitting down for a three-course meal that included crispy cauliflower, ribeye steak, parmesan-truffle fries and, of course, birthday cake.
She was raised in a Presbyterian family and rode her family's Quarter horses and a Shetland pony as a child.