There was a lot of secrecy surrounding Blake Lively giving birth to her daughter with Ryan Reynolds last year, but thanks to Reynolds, we now know it was on Dec. 16.

The proud dad took to Twitter on Wednesday to wish his first-born a Happy Birthday. Of course, he couldn’t help but to get a joke in there too.

“Happy birthday to my baby girl!” he tweeted. “Sad I lost my virginity. But thankful I have a daughter.”

The media didn’t find out about Lively giving birth until around January, so they managed to keep it under wraps for a couple of weeks. It also took them a while to confirm her name as James, with Reynolds saying he just didn’t want to be the first one to say it publicly.