Kelly Clarkson is once again proving she can sing any genre. On Monday’s episode of The Kelly Clarkson Show, the 40-year-old pop superstar belted out a piano cover of Faith Hill’s “Breathe” for the NBC talk show’s daily Kellyoke segment. Donning a simple, knee-length black dress with tights and black leather boots, Clarkson stood alongside The Kelly Clarkson Show music …