Fans of the offbeat sitcom Brooklyn Nine-Nine have been left stunned after hearing Rosa's voice in real life.

Keep scrolling to listen for yourself...

First hitting our screens in 2013, Brooklyn Nine-Nine quickly gained a cult following.

It tells the story of a younger, less experienced cop finding his feet in Brooklyn's 99th district, alongside a team of memorable characters.

There are many reasons for the show's loyal fanship.

The writing on the show is often praised for being highly hilarious - plus the stars of the show often exhibit excellent comic timing.

Which isn't to say it's been without its issues.

In fact, the series was canceled by Fox after five seasons, citing low viewing figures. Luckily for fans, it was quickly picked up by NBC, where it's undergone something of a renaissance.

But there's one thing fans of the show might not realize.

Over the years, some incredibly famous faces have enjoyed cameos in Brooklyn Nine-Nine - and with such a quick turnover, it's often something of a blink and you'll miss them situation. So, before we get into the story, here's a definitive reminder of every single one of them.

1. Fred Armisen.

In the very first episode, way back in 2013, Armisen plays a character called Mlepnos, who lives in a neighboring apartment to a recent murder scene.

2. Pete Davidson.

The now-mega star plays an at-risk kid named Steven way back in season one of the show, who's forced to attend a junior police program.

3. Niecy Nash.

In season 3, Clean House host Nash guest-starred in the series as Holt's melodramatic younger sister, Debbie.

4. Nasim Pedrad.

SNL cast member Pedrad played Jake's half-sister (and casual con artist) Katie Peralta in season five.

5. Patton Oswalt.

The comedian and actor best known for starring in King of Queens played FDNY Fire Marshal Boone for two episodes of the show in season one.

6. Bill Hader.

Captain Holt is briefly replaced by Captain Seth Dozerman, played by Hader - although he only lasts for one episode.

7. Jenny Slate.

Jenny Slate, who's also starred in Girls and indie movie Obvious Child, played loyal mafia mistress Bianca.

8. Kid Cudi.

The rapper and producer plays a wrongfully arrested convict called Dustin Whitman in season one.

9. Nick Kroll.

The hilarious comic played a Homeland Security agent in charge of a counter-terrorism drill named Kendrick back in the show's second season.

10. Adam Sandler.

Sandler had a cameo role as himself in the first season, interrupting the auction and being generally obnoxious.

11. Eva Longoria.

Desperate Housewives star Eva Longoria played Sophia Perez, a defense attorney, and brief love interest for Jake, on the show's second season.

12. Kan Marino.

Star of Wet Hot American Summer and web series Burning Love, Marino played another short-lived replacement for Holt, Captain Jason "C.J." Stentley, in season four.

13. Jorma Taccone.

Taccone, who starred in Lonely Island alongside Brooklyn Nine-Nine star Andy Samberg, plays Fun Zone manager Taylor in series four.

14. Maya Rudolph.

During Holt's stint in Witness Protection, Rudolph steps in as US Marshall Karen Haas in season four.

15. Nick Offerman.

Offerman, best known for his role as Ron Swanson in Parks and Recreation, plays Frederick, a vengeful ex-boyfriend of Holt.

16. Sterling K. Brown.

In 2018, Brown played a dentist called Phillip Davidson who was brought in for questioning regarding a murder.

17. Kathryn Hahn.

Hahn, famous for television roles in Transparent and movies like Bad Moms, played Eleanor Horstweil, the angry ex-wife of Charles.

18. Danny Trejo.

Trejo is famous for playing the villain in a huge number of action movies. He played Rosa's father, named Oscar Diaz.

19. Jimmy Smits.

This Emmy award-winning actor is best known for his role in L.A. Law. He played Victor Santiago, Amy's dad, in Brooklyn Nine-Nine's fourth season.

20. Chris Parnell.

The Saturday Night Live and 30 Rock star played Sophia's boss Geoffrey Hoytsman.

21. Jim O'Heir.

Best known as the unfortunate Gerry on Parks and Recreation, O'Heir played a deeply prejudiced and problematic Florida cop called Sheriff Reynolds.

22. Dennis Haysbert.

Haysbert may be best known for starring in those Allstate commercials, but he played collaborative FBI agent Bob Anderson who worked with the Brooklyn Nine-Nine, too.

23. Stephen Root.

He's perhaps most instantly recognizable for his role in Dodgeball, but Root made an appearance as Charles's dad back in series two.

24. Bradley Whitford.

The Get Out actor made a cameo in Brooklyn Nine-Nine as Jake's dad, Roger Peralta, in seasons two and three.

25. Katey Sagal.

The other half of Jake's parents? His mom, Karen Peralta, was played by the Sons of Anarchy actress.

26. Nathan Fillion.

The actor who's best known for his role in Firefly played an actor called Mark Deveraux in the show's fourth season.

27. Gina Gershon.

The actress, who's starred in classic movies like Face/Off and Showgirls, played Lieutenant Melanie Hawkins, a corrupt NYPD officer who causes havoc.

28. Matt Walsh.

The Veep actor plays weekend detective at the Nine-Nine, Lohank, and has cameos in seasons two, three, and four.

29. Zooey Deschanel .

The New Girl star plays the same character, Jess, in a crossover episode with Brooklyn Nine-Nine in season four.

30. Garret Dillahunt.

The Burn Notice and Raising Hope actor played a ninety-third precinct cop (and personal idol of Jake's) named Dave Major.

31. Tim Meadows.

The Mean Girls principal appears as Caleb, Jake's season five cellmate who's in prison for cannibalism.

32. Andy Richter.

The actor who's best known as Conan's sidekick played an angry doorman.

33. Blake Anderson.

The Workaholics star and musician played Constantine Kane, one of Amy's exes.

34. Ryan Phillippe.

Best known for being a nineties teen heartthrob, Phillippe plays Milton Boyle, Charles's cousin and the father of Gina's daughter.

35. Nick Cannon.

The actor and musician plays Marcus, nephew to Captain Holt, who has a romance with Rosa.

36. Craig Robinson.

Perhaps best known for his role as Darryl on The Office, Robinson plays master criminal Doug Judy, and has been in every single season at least once.

37. Ed Helms.

Another star of The Office (who you may also recognize from The Hangover), Helms played obnoxious United States Postal Inspection Service agent Jack Danger in season two.

38. Kyra Sedgwick.

The Closer star plays Captain Holt's rival Madeline Wuntch in seasons two and three.

39. Jason Mantzoukas.

The comedic actor had a recurring role as a love interest of Rosa's name Adrian Pimento. Their on-again, off-again relationship comes to an end in season five.

40. Gina Rodriguez.

Best known for her titular role in Jane the Virgin, Rodriguez plays potential Rose love-interest Alicia - and could potentially make a return.

41. Damon Wayans Jr.

He plays ninety-eighth precinct cop Detective Stevie Schillens, who used to be Jake's partner and BFF.

So as you can see, the show has been full of surprises...

But none have been as big as this.

Fans have been left stunned after hearing Rosa's real-life voice.

Played by Stephanie Beatriz, Rosa has a famous husky, low-pitched voice.

But it's a far cry from what Beatriz actually sounds like...

And quite frankly, viewers have been left unable to know what to believe anymore.

It came as a big shock to fans...

We're officially mind-blown.

How didn't we know?

"i noticed her voice was waaay higher pitched in the pilot. very interesting!"

There was a ton of reactions.

"Next you are going to tell me she’s not a cop."

Listen for yourself below:

Shook doesn't even come close.