Frank Gifford and Kathie Lee Gifford's daughter Cassidy is turning 22 next month and she's already landed her first major movie role. She spoke to ET about the challenges of pursuing acting as the child of a celebrity.

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"It's important for me to have my career completely compartmentalized and separated from my mom's," Cassidy told ET. "It's hard because 90 percent of the time there's a preconceived notion about me going in for an audition, or anything, whatever it is. But at the end of the day, she's a mom and she wants to share in the experiences and be a part of it."

Growing up famous also meant having many well-known friends. Cassidy told us that Kendall and Kylie Jenner are practically family.

"I love Kendall. I grew up with them," Cassidy said. "It's definitely different. Our careers are so different, but she's doing great and I couldn't be happier for her. We're at different stages of our life, doing different things. It's hard to stay in touch. I'm back and forth from Los Angeles to New York a lot. They're like family in a weird way."

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Cassidy stars in the horror film The Gallows, opening Friday. In the movie, tragedy strikes a small town again when students try to honor the victims of a horrific accident that took place during a school play 20 years before.

She admits that seeing herself on movie posters is taking some getting used to.

"I've been seeing everywhere, and honestly every time I see it I've been taken aback," Cassidy said. "I'm so grateful and excited about it."