On August 16, Madonna celebrates her 55th birthday. One of the most distinguished performers in the history of music, the Queen of Pop is the best-selling female artist of all time, with 12 No. 1 singles and eight No. 1 albums to her name. Her most recent LP, 'MDNA,' was released in 2012 and scored a top 10 hit with "Give Me All Your Luvin'" featuring Nicki Minaj and M.I.A. From "Material Girl," to "Like a Prayer" to "Vogue," Madonna's got hits. Get into the groove with this mix!