"My husband played 'Let's Get in On' while I was in labor," Lively told Kors while playing Fact or Fiction. "My doctor was laughing so hard that I thought she was going to drop our baby."
Lively and Reynolds married in 2012, and share two daughters, 2-year-old James and 6-month-old Ines. The couple brought both of their children to Reynolds' Hollywood Walk of Fame ceremony in December.
"This is one of the rare occasions where we thought we got to bring the whole clan," the actor told Extra at the time. "I'd regret it in 20 years if I didn't."
Lively said earlier in the Glamour Games interview that her childhood crush was David Letterman because he "had [her] dad's sense of humor." She also shared details about her first kiss.
"I was 16, and it was on camera. My first kiss was in a movie," the star said. "I was just so terrified."
Lively is known for playing Serena Van Der Woodsen on Gossip Girl, and has since starred in The Shallows and Café Society. She will next appear in All I See is You with Jason Clarke.