Pharrell Williams cries 'Happy' tears

Pharrell Williams' impeccable style and boyish good looks -- as seen here at the 2014 Elle Style Awards in February -- have convinced the Internet that he's secretly a vampire. He's not, obviously, but we understand why many can't believe that this 40-year-old superstar looks so young. Take a look back at Pharrell through the years and see if you can spot any aging:

Here's Pharrell on the right with his band N.E.R.D. in August 2002. The producer/singer/songwriter's hats have gotten bigger, but his face has stayed the same.

We know it's hard to tell, but Pharrell Williams, left, and rapper Bow Wow, center, actually aren't the same age. When this photo was taken in August 2003, Williams was 30 and Bow Wow was 16. (That's Williams' musical partner in crime, Chad Hugo of their production group The Neptunes, on the right.)

By 2004, Pharrell had been outed as the music industry's go-to guy for a chart-topping hit. But even with the increased visibility and work, do you see a stress wrinkle on this guy's face? Because we don't.

Maybe part of what makes Pharrell look forever young is his youthful approach to fashion, although we can't recommend you try this look at home.

We'd have a glow, too, if we hung out with Mariah Carey, as Pharrell did in Paris in March 2006. The pair were shooting scenes for a music video to go with their single, "Say Somethin.'"

With a nickname like Skateboard P, we know that Pharrell isn't averse to letting some physical activity put the blush in his cheeks.

Seen here with T.I. in 2008, we bet you can't guess how old either of these music stars are. (Give up? T.I. was 28 while Pharrell was 35.)

If we didn't know better, we'd think Pharrell was stuck in some sort of "Benjamin Button"-like aging process, wherein he was born looking 22 and then never ages at all.

In 2010, Pharrell tried to trick us into thinking he was aging with a mustache and a fake gold tooth, but we can see under the mask, P.

Pharrell insists that the secret to his dermatological success is simply washing his face, but we wonder if having an impressive hat repertoire has something to do with it.

From what we know of maintaining good health (and skin), you have to find time to relax, which Pharrell appears to do here at a press conference in Hong Kong in April 2012.

We'll bet you five bucks Jay Z was asking Pharrell about his skincare when they met up at the Barclays Center in September 2012.

Pharrell celebrated his 40th birthday in April 2013, but we wouldn't believe it if he didn't say so himself.

Then again, maybe Pharrell's passion for what he does helps him look so refreshed. He was clearly thrilled to take the stage with Nile Rodgers, left, and Stevie Wonder at the 2014 Grammys.

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• The singer becomes overwhelmed talking to Oprah Winfrey


• He says "Happy" is no longer just his song


• Winfrey says she gets now why the song is so popular

(CNN) -- Go ahead and grab a tissue before you watch this one.

It's hard not to get swept up in the emotion of singer/rapper/producer Pharrell Williams as he breaks down while discussing his hit song "Happy" with Oprah Winfrey. Appearing on Winfrey's "Oprah Prime" show on the OWN network, Williams said the song didn't get much traction until he released a music video in November.

Then everything went "boom."

"And we were like, 'What's happening?' " he said. "First of all, people are putting up their own videos. It was like no longer my song."

Winfrey then showed a compilation video of fans around the world displaying what "Happy" meant to them. The singer was so moved he wept.

"It's overwhelming because it's like I love what I do," Williams said. "I just appreciate the fact that people have believed in me for so long, that I could make it to this point to feel that."

Winfrey said it made her cry also.

"It's being used for something that's greater than yourself," she said. "I get that."

After Williams' clearly genuine reaction, Winfrey also had some thoughts as to why the song has become so popular.

"I so now get why it's so infectious," she said. "Because it came from such a clear space that the energy was absolutely uninterrupted by anything other than allowing it to flow from heart to heart."