We're warning you now. This photo is going to bring a big fat smile to your face.

Tom Arnold was an extra-busy dad Sunday as he celebrated son Jax's 6-month birthday. In between diaper duty and nap time, the 54-year-old actor took time to show how handsome his little boy has become.

In a brand new WhoSay image photographed by Gremly Media, Arnold captured Jax relaxing in a giant bowl of Cheerios. And even though his teeth are still coming in, the smiling baby proved he was more than excited to celebrate his big day with daddy.

"This happy little man turned 6 months old today and I feel the exact same way," Arnold shared with his followers.  

The milestone is extra special for Arnold who once worried that he may never become a father.

"I didn't think it was in the cards for me, to be honest, and so I was completely shocked," Arnold said on The View after discovering his wife, Ashley Groussman, was pregnant. "It's a miracle."

Today, the comedian can't help but capture all of the important moments in his newest family member's life.

Congratulations, Tom! We can't wait to celebrate Jax's first birthday with you. 

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