Blake Lively's Sister Robyn and Her 3 Kids Support Uncle Ryan Reynolds at Deadpool & Wolverine N.Y.C. Premiere

Robyn Lively is one supportive sister.

The actress and sister of Blake Lively hit the red carpet on Monday, July 22, for the New York City premiere of Deadpool & Wolverine. Joined by her sons Baylen, 21, Wyatt, 16, and daughter Kate, 19, whom she shares with husband Bart Johnson, the close-knit family showed their support to the film's star and the kids' uncle Ryan Reynolds.

Robyn stepped out in a long black corset dress and silver dangling earrings. Kate posed to her right, wearing a black and white polka dot maxi dress.

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Baylen and Wyatt smiled on their mom's left, sporting matching gray trousers and tees. Baylen rocked a Khaki-colored suede jacket to complete his look, while Wyatt opted for a brown leather jacket.

It was at the new Marvel movie's premiere that Reynolds revealed the name of his and Blake's fourth child, whom they welcomed together in February 2023.

He took the stage with his costars and director Shawn Levy and gave a heartfelt speech at the David H. Koch Theater, during which he thanked Lively while sweetly saluting her ensemble for the evening.

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"Her outfit is amazing, spoiler alert," he joked to a laughing crowd.

He then sent love to their children: James, 9, Inez, 7, and Betty, 4, and another child named Olin.

"I love that my entire family is here," he continued.

PEOPLE announced in February that the It Ends With Us actress, 36, and Reynolds welcomed baby number four. They have not revealed the sex of their youngest child.