By Alexis Simpson The lovely and gracious Regina Spektor performed at The Fillmore Detroit this past Saturday for a packed venue full of devoted fans. Regina is touring this year in support of her latest release, What We Saw From the Cheap Seats. Her performance drew in a fashionable Detroit crowd, with many die-hard fans playfully imitating Regina’s whimsical full-skirted feminine style.   Most of the performance, Regina sang from behind her piano but she did venture to center stage several times in order to maximize her interaction with her audience. The Russian-born beauty who was raised in the Bronx, performed with the poise and polish of a classically trained artist who knows…