Ignoring serialization of BitmapImage?

I have a ViewModel containing a couple of public and private strings and one public BitmapImage, and when trying to serialize an instance of that ViewModel I get "'System.Windows.Media.ImageSource' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute."

How to ignore the serialization of the BitmapImage (I guess that's the issue) since that object is fetched from local storage in the get property?