Matt Groening’s initials are discreetly drawn into Homer Simpson’s character

The Simpsons creator Matt Groening's initials are discreetly drawn on Homer Simpsons character.

After 35 years on air, you'd be forgiven for believing you know everything about the world's most famous animated family.

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The long-running series has given the world countless iconic pop culture moments, many of them thanks to the hapless power plant nuclear safety inspector — but did you know he also bears the initials of his creator?

The Simpson family’s appearance has been tweaked and refined a few times since they debuted on television in 1987 on The Tracey Ullman Show.

The middle-aged dad is yellow, just like the rest of his family, he has a pot belly, he’s balding and wears blue jeans with a simple white t-shirt.

We've heard of people getting words or letters designed into their skin fades but this is something different. Hidden in one of the father-of-three's last remaining strands of hair and his ear you may notice what looks like two important letters.

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Simpson fans with a keen eye will what looks like an M.G. looks like for series creator Matt Groening’s name.

The M is written in Homer’s hair on the side of his and just before his air.

The G is a little harder to spot and lies within Homer’s ear. The outline of the letter works with some of the lines in Homer’s inner ear.

Once you’ve spotted both letters it’s almost impossible to see them as just regular strands of hair.

So just like Regina George, Homer Simpsons' hair is full of secrets, or in this case, initials.

Although Groening has never confirmed this theory, it is widely believed among Simpson fans especially on Reddit.

Another reasons why the Simpson family are so recognisable is because of their distinctive yellow colour. But why did Groening decide to make them yellow, instead of any of the other colours in the rainbow?

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In an interview with the BBC, Groening revealed how he wanted to make the series and its characters unique, so he wanted that to start with a bold colour.

He revealed that an animator came up with the idea of yellow and he was instantly sold.

"An animator came up with the Simpsons’ yellow and as soon as she showed it to me I said, 'This is the answer!' When you’re flicking through channels with your remote control, and a flash of yellow goes by, you’ll know you’re watching The Simpsons," he said.

We won't be able to look at Homer Simpson the same way again.