It's Justin Bieber's birthday! Hailey Baldwin's husband is turning 27 this Monday.

Bieber remains one of the biggest pop stars in the world over a decade since releasing his debut EP in 2009. While fans know a lot about the singer through social media and reports, from his past romance with Selena Gomez to his antics, there may be some little things that they have missed.

In honor of Bieber's birthday, here are 13 weird and interesting facts about the Canadian superstar that fans may not know.

1. Fans had a name for his penis

Fans of the crooner can get as weird as weird gets. In an interview back in 2015, Bieber confessed that his supporters actually came up with a name for his package after nude photos of him surfaced.

"The fans do, they call it 'Jerry,'" said the pop star.

2. He speaks French fluently

As if being a talented singer wasn't enough, Bieber is also fluent in speaking French and can even count to 10 in German.

3. He's claustrophobic

The singer is uncomfortable being in crowded spaces, according to Teen Vogue.

4. He regrets not saving himself for marriage

Last year, the Canadian superstar admitted in his and wife Hailey's Facebook Watch series, "The Biebers on Watch," that he wished he had remained a virgin until marriage.

The topic came up during a Q&A session on the series when one fan asked if there is anything the singer would like to change if he could go back in time.

“I don’t regret anything because I think it makes you who you are, you learn from things, but if I could go back and not have to face some of the bad hurt that I went through, yeah, I would’ve probably saved myself for marriage," he shared.

Bieber explained, "I know this sounds crazy, but I don’t think it’s too much information, I think it’s helpful. Sex can be kind of, uh, confusing when you’re just kind of being sexually active with anybody…it’s just true. I would have probably saved myself for marriage.”

5. Bieber taught himself how to play several instruments

The singer taught himself how to play the piano, trumpet and guitar and took drum lessons while growing up in Stratford, Ontario. He also received some help on the guitar from his dad, Jeremy Bieber.

One of the first songs he learned on the guitar was Bob Dylan's "Knockin' on Heaven's Door."

6. "The Notebook" is one of his favorite films

A softie for romance films, Bieber confessed that "The Notebook" is one of his favorite movies. But who doesn't want to have a good cry over a Nicholas Sparks movie every now and then?

7. He has the internet to thank for his fame

Bieber got his start on YouTube after his mother posted a video of his performance on the platform for friends and family to watch. Little did they know that it would be the start of his career as he was soon discovered by manager Scooter Braun, Billboard reported.

8. Bieber's favorite sandwich

For those who are wondering what the singer likes to snack on, Bieber's favorite sandwich is tomato and mayo on Wonder Bread.

9. Bieber loves Disney

He once took ex-girlfriend Selena Gomez to Disneyland and tweeted about "The Lion King" -- a movie that he says will never get old.

10. "Smallville" and "Friends" are his favorite TV shows

Bieber said in an interview with Time magazine that he enjoys watching shows like "Friends."

11. He was once the most-followed person on Twitter

Bieber beat Lady Gaga and Katy Perry in January 2013 to become the most followed person on Twitter -- boasting about 33.3 million followers at the time.

He remains one of the most followed people on the platform as of this year, with 113.7 million followers. Only former President Barack Obama has more, boasting 127.9 million followers, per Brandwatch.

12. His father Jeremy is a former MMA fighter

While his dad was once a mixed martial artist, Bieber only went through a boxing "phase." The singer once bought every piece of boxing equipment and underwent one intense training session before losing interest, according to GQ.

13. Usher started his career

While R&B singer Usher initially turned him down, he eventually had a change of heart -- and the rest is history.

Justin Bieber Hailey Baldwin
Justin Bieber and Hailey Baldwin seen on the streets of Brooklyn on Sept. 14, 2018 in New York City. James Devaney/GC Images