Will Smith playfully trolled his son Jaden Smith on his 25th birthday.

The 54-year-old took to his Instagram on Saturday for a happy birthday post showing himself and Jaden in a black-and-white photo.

In his caption, Smith left a touching message for his son while also admitting he was shocked that not only is Jaden 25, but he has no kids.   

"Happy Birthday, J-Diggy. It's crazy that you're 25?!?! When I was 25 I had a 2 yr. old… I'm just sayin'… Wha's up? What you doin' over there? BTW, this is my favourite picture of us. 📷 @jas," Smith wrote.

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When Will was 25 years old, he was already a TV show regular with his starring role in The Fresh Prince of Bel-Air, and his eldest son Trey was two years old. Jaden is Will's second-born child after Trey and before his youngest daughter Willow.

Will shares Jaden and Willow with his wife Jada Pinkett Smith, while Trey was born during his previous marriage to Sheree Zampino.

Last month at the Psychedelic Science conference in Denver, Jaden revealed that he and his family use psychedelic drugs, which he said his mom introduced to her household.

"I think it was my mom, actually, that was really the first one to make that step for the family," Jaden said at the conference, according to USA Today. "It was just her for a really, really long time, and then eventually it just trickled and evolved, and everybody found it in their own ways."