Being in her first music video with the rapper "was really fun," Kardashian told PEOPLE at Foxwoods Resort Casino's Liquid Sundays pool party in Connecticut, which she attended along with fellow reality star Scott Disick.
But it hasn't given her the acting bug. "It was my first music video so I didn't do a lot of acting," she joked. "I did a lot of posing. Being in a music video you're more like posing, so I was good with that."
As for working with someone she's also romantic with, she said, "It was great. It was easy. It was like I didn't even realize it was [work] ... we were just having fun. It didn't seem that serious – we were just comfortable hanging out. He's a great talent."
Once inside the party, Kardashian was in good spirits, sipping champagne, interacting with fans – at one point she sprayed champagne on a bunch of bikini-clad party-goers who were hanging out in the pool – but she kept her poker face on when Montana's song, "Pop That" started blaring over the speakers.