Christina Aguilera is all thigh-highs, unbuttoned, and pantless to celebrate International Women's Day. The 40-year-old singing superstar dropped her Monday Instagram update right on time for a calendar date being marked by everyone from Kelly Ripa to Jessica Simpson – joining them, the "Stripped" songstress updated for her 7.4 million followers and with one heck of a post. Xtina, who went as far as to shout out U.S. VP Kamala Harris' famous "I'm speaking" moment last year, also included her killer body and no pants. Check it out below.