The Queen of Pop is a year older, and she's still going more than strong. Madonna , who turned 61 years young on Friday, marked her special day with a trio of posts to her Instagram, featuring the superstar in full military regalia and fishnets in one picture and revealing impromptu celebrations in two videos. Currently in the throes of rehearsal for her Madame X theater tour starting this fall, the Material Girl was seen in one of the Instagram videos among her crew of dancers for the tour, receiving birthday donuts as the cheering crowd held red and white Madame X balloons. All hail this Queen of Pop: Madonna turned 61 years young on Friday, and marked her special day with a trio of posts to her Instagram 'This is the beginning of three marvelous nights of celebration, and it all starts with donuts,' Madonna said, wearing a black t-shirt and a beige bandanna on her head. 'Dig in, motherf---ers!!' As a percussive beat starts, the crowd cheers an