As we all know very well, the Super Bowl is just as much about the celebrities who are in the crowd as it is about one team achieving glory.
He also shares daughter Darby with his wife of more than 20 years, Julie Yaeger, but the pair seemed to have headed to the Allegiant Stadium in Las Vegas for a father and son day out this Sunday (11 February).
After the image started doing the rounds, fans of Rudd all pointed out the same thing about the Super Bowl attendees.
A lot of people reckon it has a lot to do with the actor's unrelenting dedication to leading a healthy lifestyle, which has seemingly allowed him to drain the fountain of youth.
It’s something of a Hollywood trope, because everyone knows that Rudd looks exactly the same in recent films as he did playing roles back in the 1990s.
Still, he’s 54 years old in reality, so there must be some sort of secret behind it, right?
According to Rudd, the key is a good night's sleep.
In an interview with Men’s Health, Rudd was asked to reveal the truth behind his ageless appearance.
Instead of lying and saying he’s had loads of work done - which might have been funnier - he gave a bit of a walkthrough of his daily routine and diet.
Rudd said: “Sleep. Then diet. Then weights. Then cardio. People ask me, ‘Can you send me your meal plan? How many times a week do you work out? Do you drink? Do you eat carbs? Do you have a cheat day?’
“The most important part of training is sleep.”
So it's hardly any surprise that this age-defying actor is getting told that he is the spitting image of his son Jack - who may I remind you, is 36 years his junior.
After seeing Rudd and his 'twin' swanning about the Super Bowl, fans took to social media to share their thoughts about the extraordinary family resemblance.
One said: "Paul Rudd's son is the image of him, when he was Mike in Friends. I thought the son was him and was thinking WOW he hasn't aged."
Another wrote: "Goodness, Paul Rudd’s son is his clone!"
A third added: "Every time I look at Paul Rudd's son I'm reminded of how much he looks like his dad."
And a fourth chimed in: "Paul Rudd's son looks exactly like him whoa!"Featured Image Credit: Jamie Squire/Getty Images/CBS