KELLIE PICKLER'S been looking pretty darn good lately, and I wanna know her secret!! You may recall this photo of Kellie in a bikini that was "accidentally leaked" a couple of months ago . . . Well, we're not the only ones who've noticed. "Self" magazine asked Kellie if she has any secret exercise tips. She does. She said, quote, "Vacuum in your heels! You'll get serious calves, feel these suckers!"