Celebrating Katherine McNamara's 21st Birthday With Our 21 Favorite Kat Moments! It was really hard to keep the list at just 21. 1. When she blew us a kiss and broke all of our hearts. 2. When she told us about her character's feud with Alec. 3. When she loved Magnus and totally understood his character. 4. When she just wanted to help everyone! 5. When she showed us some of her sick stunt moves with Matt. 6. When she managed to stay professional even with one of the most handsome men alive standing right in front of her! 7. When she admitted that she has the most bruises on set. 8. When she was so good at playing herself while imitating Maureen! 9. When she got thrown on her ass and was totally chill about it! 10. When she managed to look completely glam while standing out in the rain. 11. When she took time out in between scenes to practice her dance moves. Brought to you by: 12. When she threw shade like a pro. 13. When she knew how important it was to have good snacks on set! 14. When she tried to teach Alberto how to use a Stele. 15. When Dom kept pranking her and she was a really good sport about it. 16. When she looked more beautiful as a sketch than we ever could in real life! 17. When she totally understood the technical side of filming Shadowhunters. 18. When she was so over male rivalry! Same, Kat. 19. When she out-sarcasm-ed Matthew Daddario and deserved a medal! 20. When she was just as excited about Season 2 as the rest of us. 21. Basically, when we just fell in love with her the first moment we found out she had been cast as Clary! Happy Birthday, Katherine! Tell us your favorite things about Kat in the comments!