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In this day and age, it's pretty hard to keep a good secret in Hollywood.

But somehow, someway, the Fantastic Beasts and Where to Find Them cast was able to zip their lips for a long time in regards to Johnny Depp's cameo in the film. So how did they do it? As it turns out, timing is everything.

"Wait, Johnny Depp is in this movie? We know nothing. We can reveal nothing," Eddie Redmayne joked to E! News. "One of the wonderful things about making this film was the story that J.K. Rowling had written and the surprises and secrecy for it."

He continued, "I know in the age of social media, it's impossible to keep those secrets but if there's any way we can keep some of them secret, it would be so lovely to do."

Just one day after Halloween, reports surfaced that Johnny would be joining the cast for the second installment of the franchise.

Fantastic Beasts and Where to Find Them, Johnny Depp

Jaap Buitendijk/Warner Bros.; Getty Images

In addition, Deadline hinted that you may be able to spot the famous actor in the first installment when it hits theaters November 18.

"We didn't have to keep it for that long because we only found out shortly before it was released publicly, luckily," Alison Sudol confessed to E! News. "And we've had to keep so many secrets at this point that we basically are used to having to be vaults."

"I didn't know until very late so I didn't feel like I had to keep [it a secret]," Colin Farrell added before cracking a joke. "I don't have any friends so." Johnny's exact role in the film remains pretty tight-lip, for now.

For those not up to date on one of the year's most anticipated movies, Fantastic Beasts documents the adventures of writer Newt Scamander in New York's secret community of witches and wizards 70 years before Harry Potter reads his book in school.

With less than two weeks until the Warner Bros film hits theaters everywhere, the cast can feel the excitement surrounding the project.

"The stakes are high because [Harry Potter movies] were so good before," Eddie shared with E! News' Marc Malkin last September. "You don't want to screw it up."

He added, "It's a complete privilege for me. I love J.K. Rowling. I love the Harry Potter films [and] books so for me this is just the most wondrous gift really."