Lively, who has been wearing tons of floral looks during the film's press tour, stepped out in another floral dress.
The look was a vintage Versace midi dress with sequined floral designs and one-shouldered strap detail. She told that Britney Spears previously wore the look in 2002.
Also in attendance were Lively's sister, Robyn Lively, and her family.
"Deadpool & Wolverine" star Hugh Jackman also came out to support Lively, who showed her support to Reynolds and Jackman in July during the "Deadpool & Wolverine" premiere in New York City.
Lively's highly anticipated upcoming film is based on author Colleen Hoover's bestselling 2016 novel "It Ends With Us."
Read more the upcoming film here.