hard enough to tell apart at the best of times, but when Reese Witherspoon and her daughter Ava Phillippe wear matching face masks, it’s virtually impossible to know who is who!That was the verdict of many of the Oscar-winning actress’ Instagram followers in any case when Reese posted a cute pic on Christmas Day of the mother-daughter pair doing some last-minute shopping with their faces partly obscured by tartan face masks.MORE: Reese Witherspoon’s never-before-seen childhood photo is too cute