The Deadpool 2 actor was a guest on Tuesday's Good Morning America, where he joked about their 3-year-old daughter, James, being featured in the intro of Taylor Swift's song, "Gorgeous."
"I don't know about starring, but a little intro there, yeah, umm," he started telling host George Stephanopolous, playing coy. "That was a voice memo that ended up on a [Taylor Swift] song. It's pretty amazing."
"My daughter has a really, really terrible ego problem now after that song," he joked. "Oh, she's insufferable."
"Yeah, so, she's in a Taylor Swift song," he added. "I don't know if she knows she's in a Taylor Swift song."
Reynolds, who also shares a 1-year-old daughter, Ines, with Lively, continued to make jokes throughout the interview, saying that he wouldn't want to get his kids into show business "mostly because I'm against child abuse."
"I mean, show business for kids, that's a crazy pursuit," he continued. "Acting is great. Go theater, school, that kind of thing, amazing. [But] I don't know why you would put your kid in show business."
ET was with Reynolds one day earlier, at the premiere of Deadpool 2 in New York City, where he couldn't stop gushing over his family, especially Lively.
"Oh, I'm Mr. Lively 24/7," he adorably shared, referring to the nickname Book Club stars Diane Keaton, Jane Fonda, Candice Bergen and Mary Steenburgen, gave him. "And I'm happy about it. It's great. [It's the] best gig."
Meanwhile, Swift is currently on her Reputation stadium tour, which kicked off May 8 at University of Phoenix Stadium in Glendale, Arizona. Hear highlights (and see pics!) from her first show in the video below.