Actress Sophia Bush, of 'One Tree Hill' fame, has revealed that starring in 'Chicago P.D.' alongside Lady Gaga's boyfriend is really exciting and admitted that the 'Born This Way' superstar doesn't get fazed by the love scenes they shoot together. 

Speaking to Digital Spy about her co-star Taylor Kinney (pictured left with Bush) and his relationship with Lady Gaga, she explained that because Gaga is an artist she understands what it means to have to do certain things while playing a character:

"[Gaga is] an artist through and through. There's no part of her that doesn't understand our job or thinks it's weird. I thinks she's probably the least threatened woman on the planet. It's always a little strange to meet the love of someone's life after you've swapped spit with their partner!

Bush added that she was bowled over by Gaga's warm personality: "But she's just the loveliest human being and so warm and welcoming - I've been such a huge fan of her for so long."

"I didn't get to meet Stef until after Taylor and I started to work - I was really glad I had a while to wrap my head around it, because if I'd have met her in my first week in Chicago, I probably would have cried and it would have been real awkward for everyone!"

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Watch Bush talking about being on 'Chicago P.D.' below: