Nick Zano
Kat began dating her 2 Broke Girls costar at the end of 2011. The pair met while working on the show, with Kat telling Glamour of the relationship in 2012, "Yes! I have nothing to hide! It's the truth! He's the best!" Much like the characters of Max and Johnny on the show, the relationship wasn't meant to last and they called it quits in 2014.
Image Source: Getty / Jeffrey Mayer