It's fine, it's cool. You can say that we are nothing, but you know the truth. And guess I'm the fool With her arms out like an angel through the car sunroof, I don't wanna call it off, but you don't wanna call it love. You only wanna be the one that I call "baby" Kevin Costner and his co-star Kenzie had been having a love affair for a while. The two have been together since she joined Yellowstone back in season two. They'd never shared the screen before, which was weird since both of them had been working for quite a while in Hollywood she's been working in Hollywood since she was a baby, and he was in his twenties. She's 24, and he's 54. There's a 30 age gap, but they're so in love that it nots funny how much they love each other. It all started cause their characters are dating on Yellowstone, and they ended up falling for each other in real life. They were keeping it a secret for now cause they knew the world would judge them they're both consenting adults so what did it matter they didn't meet till she was 22 so she's legal very legal at that. Or they were gonna keep it quiet till she got pregnant, and then rumors started to fly about who the father is. Even their other co-stars had no idea they had written her pregnancy into the show. It had been months, and now she was 6 months along her, Kevin, Cole, and Kelly were sitting on set when Kelly decided to ask her the hot question everyone wants to know. Kelly: I don't wanna sound mean dear but do you even know who the father is? she asked her British accent coming out Kevin looked down at his lap he was sitting right next to her then again Cole was sitting right next to Kelly so.