She’s stepping up the city’s springtime pizzazz — one faux flower installation at a time. To beautify her block after NYC execs covered it in “ugly” scaffolding, Kristi Hemric, 36, a married Upper East Side mom of four, routinely decks out her stoop with lavish fake floral displays. She’s even been known to glam up her doorway with toy blossoms from LEGO’s Botanical collection. It’s a costly, yet cutesy pastime of the millennial, who — unlike the grumpy owners of Carrie Bradshaw’s iconic “Sex and the City” stairway — wants folks to come snap selfies and make memories outside of her front door.