Gwen Stefani -- Blake Makes Me Happy ... at the Happiest Place on Earth

Gwen Stefani just can't get herself enough of Blake Shelton ... she had to get her fix while strolling the grounds of Disneyland.

Gwen and her 3 kids hit up the theme park Friday, and Gwen multi-tasked with her iPhone as they walked from Toontown to the Small World ride.

Apple keeps 'em close.