Let's kick things off by taking it all the way back to 2003, when Timberlake appeared on an episode of MTV's PUNK'D. Resident prankster Ashton Kutcher almost made JT cry when his team of faux agents seized Timberlake's property and collected his valuables, telling him he owed $900,000 in income taxes.
It's cool, JT. It's your birthday, and we'll let you get away with crying if you want to.
2. He smokes weed (or, at least, there was a time when he did).
Fast forward to 2011, when the "Cry Me a River" singer admitted to Playboy that he was "so stoned" when Kutcher played the televised prank on him.
"I actually stopped smoking pot for nine to 10 months after that," he dished. "If you ask my friends, if they're honest, they would probably say that's the only way to get me as dizzy as I was. What you didn't see from the episode, because it was a 45-minute affair cut down to 10 minutes, was me showing up and being like, 'What the f**k are you people doing on my property? Get the f**k off my property! Get the f**k out of here!' Then they started rattling off my parents' address, and I was like, 'Holy s**t. Hold on a second.' I mean, everybody was got good on that show -- me probably the best."
3. Everyone loves his music, even fast food chains.
You know that "Ba-ba-da-da-da. I'm lovin' it" jingle that plays during McDonald's commercials? Well, you can thank JT for that!
The fast food chain loved his 2003 song "I’m Lovin' It" so much, they decided to use a version of it as their signature tune.
4. He can literally sing about anything, even his genitals.
While the birthday boy has given his fans a tremendous amount of gifts over his time in the spotlight, the most memorable of them all has to be the "D**k in a Box" skit he performed with The Lonely Island crew on Saturday Night Live in 2006.
5. Despite his celebrity status, he's still had to use a fake I.D.
Back in 1999, as *NSYNC was on the rise of fame, Dawson's Creek star James Van Der Beek helped get a then-underage Timberlake into a Las Vegas night club.
"I went in and somehow passed my ID back so that Justin could get back with my ID," Van Der Beek told The Huffington Post in 2014. "And then Justin got in and then tried to pass it off to Lance [Bass] to get in. By the third time [the bouncers] saw a James Van Der Beek ID, they were like, 'Ah, I don’t think so James.'"
6. Britney Spears isn't his only famous ex-girlfriend.
Even though he and his fellow boybanders were turned away from the club, their lives were still pretty G-L-A-M-O-R-O-U-S, especially for Timberlake, who once dated Fergie!
Before he famously dated Britney Spears in 1999, the now-married heartthrob -- he and his wife, Jessica Biel, wed in 2012 and have a 9-month-old son, Silas Randall Timerblake -- was getting cozy with the Black Eyed Peas frontwoman.
"He was 16 and I was 23," Fergie explained to Australia's Courier Mail. "It was before he got real heavy with Britney."
Last but not least, our favorite story of them all: JT briefly lived with The Big Short actor.
Back when the two starred together on The Mickey Mouse Club, Timberlake's mom, Lynn Harless, took in little Gos.
"Funny enough, his mother had to keep her job in Canada the second year that we were on the television show, and my mom was his guardian for 6 months, so we actually lived together when we were that age" he told Ellen DeGeneres in 2011. "We were probably a little closer than the rest of the kids that were on the show because, you know, we had to share a bathroom."
"We used to do terrible things. We thought we were so cool when we were on The Mickey Mouse Club," he continued. "We stole a golf cart, and we were like, 'Yeah, man, we're stealing a golf cart!' But on a backlot, there's just golf carts everywhere, so we 'stole' the golf cart and we drove into MGM studios, which is totally illegal by the way, and I was like, 'What you wanna do thug?' and he was like, 'I dunno, cous.' That's definitely how we talked. And then we got milkshakes."