Wheel of Fortune wedding bells? Vanna White and real estate developer John Donaldson started dating in 2012 — and according to a source, they are finally ready to say “I Do” after 12 amazing years together. “John’s always wanted to make it official, but Vanna was hesitant, only because she didn’t feel it was necessary to marry again,” a friend spilled to a news outlet, referring to the game show star’s first marriage to George Santo Pietro from 1990 until 2002. “Things change though,” the pal added. “Vanna just feels like the timing is right.” Per the source, White and Donaldson are considerin…