There have been some great movies that have hit the big screens this year, but what movie trailer has garnered the most views?

Before I tell you, guess: 'Guardians of the Galaxy'?

How about the new 'Hobbit 3: The Battle of the Five Armies'?

Nope. The movie trailer that has had the most views so far this year is: 'Fifty Shades of Grey'.

According to a tracking firm called Zefr, it's racked up 36.4 million YouTube views since it was released last Thursday. (Including about 12.5 million views on the official site alone.) The previous high for the year was"Teenage Mutant Ninja Turtles" with 31 million views.