Ryan Reynolds Shares First Pic of Daughter James!

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Ryan Reynolds is now officially on Instagram, and he made sure he started off with a bang.

On Thursday, the Deadpool actor posted an adorable photo of his daughter James' hand clutching his thumb, writing, "Thumb wrestling isn't always fair."

PHOTOS: Stars Share Pics of Their Cute Kids

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The 38-year-old actor's wife, Blake Lively, took to her own Instagram to show her husband some love. She reposted the sweet snap, which is the first picture of baby James that the notoriously private couple has ever shared.

" ... And with that, my husband @vancityreynolds joins Insta," she confirmed.

Ryan and Blake welcomed James in December. Last month, Blake revealed how life has changed for the amazingly attractive couple, who've been married since September 2012.

"Everything is different, you know? You see a balcony and you're like, 'Oh, my God! The hotel needs to demolish this balcony because my child can't go anywhere near it,'" she joked on Live! With Kelly and Michael. "So everything is just so much more heightened. We're crying all the time for no reason."

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ET recently caught up with the 27-year-old actress, when she dished that she's been saving clothes for her lucky daughter since she was 16.

"They're never going to want it, but that's why I'm happy to have had a girl because I have a lot of things I've been hoarding with the excuse to pass it down to her," she explained to ET.

Watch below!