"Karl is great. He's exactly who you see," Davidson said of Cuoco's boyfriend. "He loves cooking and he's gentle and he's a kind person. I'm really happy because she deserves to be treated well."
As for whether Davidson thinks Cook is "the one" for her friend, she responded, "I hope so. I do, yeah."
Davidson further explained why she thinks their relationship works. "I think the fact that they have something outside of the industry that brings them together -- the fact that he's an equestrian and she's an equestrian," she noted. "She's such an animal lover, advocate. That brings them even closer together."
"They make sense. I'm so happy for her," Davidson continued. "I told her, I'm like, 'You deserve the world.' We can't settle, especially when it comes to love. It's so important."
Davidson also gushed to ET over how much Cuoco meant to her as a friend. "Kaley has been such a support system over the years for everybody. She is a sister," she shared. "I don't have a sister, so we've always said, 'sisters.' You go through something so tragic that nothing can break that bond. She's a powerhouse. I'm so proud of her."