Fans of Shrek will be pleased to hear that all of the films are going to be converted into 3D.
Shrek, Shrek 2 and Shrek the Third will all be made into 3D Blu-ray to watch at home.
And the fourth Shrek movie, called Shrek Forever After, will be released in 3D at the cinema when it comes out in July this year.
Dreamworks Studios, which makes Shrek, said it's confident the 3D films will look good and please fans.
The final film sees Shrek get conned into signing a contract which puts him into a different version of Far Far Away, where lots of things have changed.
Puss in Boots
All of the favourite characters are back for the last instalment, including Shrek, Donkey, Fiona and Puss in Boots.
The film-makers hope they'll make more money by releasing the fourth movie on DVD, as film companies are losing money because people are buying pirate copies.
The Shrek films have made more than £1.3 billion since the first release in 2001.