Gwen Stefani and Blake Shelton’s romance is straight out of a storybook! The lovebirds — who celebrated their third wedding anniversary on July 3 — are still in awe of one another more than a decade after initially meeting as fellow coaches on The Voice in 2014. “Gwen and Blake are doing amazing,” a source recently spilled to a news publication of the spouses. “They’re more in love than ever.” “It feels surreal because the time has flown by,” the insider explained of the couple’s marriage. Though some might say Shelton and Stefani are quite the unexpected pairing, others argue it is their diff…