Ryan Reynolds shared the name of his fourth baby with wife Blake Lively at the 'Deadpool & Wolverine' premiere.

The duo, who were already parents to three daughters, welcomed baby No. 4 in February 2023.

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US actress Blake Lively and husband Canadian actor Ryan Reynolds attend the premiere of "Pokemon Detective Pikachu" at Military Island - Times Square on May 02, 2019 in New York City. ANGELA WEISS/AFP via Getty Images

The actor shared the couple's newest addition was named Olin.

Reynolds, 47, joined his costars and director Shawn Levy on-stage during the NYC premiere of his new movie 'Deadpool & Wolverine' on Monday. During his touching speech at the David H. Koch Theater, he expressed gratitude to Lively and praised her stunning outfit for the night.

"Her outfit is incredible, just a heads-up," he quipped to the amused audience.

Ryan Reynolds and Hugh Jackman
Hugh Jackman (L) and Ryan Reynolds attend The Adam Project World Premiere at Alice Tully Hall on February 28, 2022 in New York City. Noam Galai/Getty Images for Netflix

He also gave a shout-out to their kids; daughters James, 9, Inez, 7, and Betty, 4, along with their youngest, Olin.

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

Although Reynolds revealed Olin's name, they have not disclosed Olin's gender.

In May, Reynolds hinted at the toddler's name while on the 'TODAY' show.

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Actors Blake Lively and Ryan Reynolds attend the 74th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 8, 2017 in Beverly Hills, California. Frazer Harrison/Getty Images

"Taylor Swift keeps slipping it into her lyrics!" co-host Savannah Guthrie joked, likely referencing Swift's song "Betty" from her 2020 album 'Folklore,' which features the names of his older three children.

When asked if Taylor Swift's latest album, 'The Tortured Poets Department,' offered any clues about their baby's name, Reynolds quipped, "We always let Taylor decide the name, and I'll say this: We're still waiting."

Although Reynolds and Lively are keeping certain details about their children under wraps, he mentioned on 'TODAY' in 2022 that neither he nor the 'Gossip Girl' star, who was pregnant with Olin at the time, knew the baby's gender, adding that they "never find out until they're born."

'Deadpool & Wolverine' hits theaters on July 25.

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Ryan Reynolds, Blake Lively, Deadpool, Taylor Swift