Using exists() on queryset for a User

I'm trying to check if a user with a specified email already exists.
According to the docs, it's better to use the .exists() method.

I tried this:

if User.objects.exists(email = data['email']):
raise forms.ValidationError(u'Email Already Exists')

However, I get this error:

exists() got an unexpected keyword argument 'email'

I'm just going to assume I went about this the wrong way. Any
suggestions on how to do it the right way?

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