Liar, Liar actor reveals he received fan mail from PRISONERS when he was just a kid after finding fame as a child star

For Liar, Liar child star Justin Cooper, becoming famous at eight years old led to some bizarre realities.

Cooper, now 37, played Max Reede, the young son of Jim Carrey's character in the 1997 hit comedy.

Speaking on The Not So Little Rascals podcast, the former child star revealed that after the movie came out he received unsettling fan mail from prisoners, which his protective mom kept from him until years later.

Cooper told hosts Jordan Warhol and Blake Collins that he got letters from 'dudes in jail talking about how they're such a big fan of me and I'm such a cute kid.'

The topic came up when Collins asked if there were moments when fame was 'overwhelming or kind of scary,' and Cooper answered, 'My mom did a really good job of shielding me from stuff.

'She would tell me later on about prison mail that I would get that she never showed me, letters from people in jail.'

'I never got any prison mail, I’m kind of jealous,' Collins commented.

Cooper continued, 'She never left me alone with anybody on set. There's a lot of acting parents you hear of back in the day that go, "Do whatever they tell you to do." And my mom was not like that.'

Nevertheless, Cooper said he enjoyed fame as an eight-year-old rising star.

'I thought it was cool. I think it probably annoyed my family a little bit more. We would go to Hometown Buffet for dinner and there would be this line at my table of people wanting to get my autograph and my family is trying to eat dinner. I didn't mind it.'

Cooper also spoke about working with improv master Carrey.

'Being with him was fun, watching him work, and he was goofy all the time,' he said.

Carrey actually played a dual role in the movie, making a hidden background cameo as Fire Marshall Bill during the chaotic airport climax when his main character, Fletcher Reede, gets flung off the mobile stairs on the runway.

'I tried to make myself cry talking to him on the stretcher and behind me, he's in the background as Fire Marshall Bill. If I remember correctly, he didn't tell many people in the crew that he was going to do that,' Cooper shared.

He also mentioned that before he got the part, Carrey wanted to meet him.

'Apparently there was a previous child actor he didn't mesh well and since then he was like, "I gotta meet him beforehand,"' Cooper relayed.

'I was excited. At that point, what I knew Jim Carrey from was The Mask. It was my big Jim Carrey movie. And also Batman Forever. Growing up, I wasn't allowed to see any R-rated movies, even some PG-13 movies.'

He said he wasn't allowed to see Ace Ventura, another movie starring Carrey, 'because it was too raunchy.'

‘I was never scared to meet and talk with people, that was no big deal,' Cooper added.

After Liar, Liar, Cooper appeared in several television shows and movies including the title role of Dennis Mitchell in 1998’s Dennis the Menace Strikes Again! and the 1998-1999 series Brother’s Keeper.

He also made appearances in Touched by an Angel in 1999, All About Us in 2001, and Sacred Ground in 2002, before his final onscreen acting gig in The Practice in 2003.

Cooper traded acting for behind-the-scenes work and currently serves as an executive producer for The Ben Maller Show on Fox Sports Radio.