Britney Spears is reflecting on her luck on the 20-year anniversary of her hit song, "Lucky." The 38-year-old took to her Instagram Story to address her fans, thanking them for all their support over her decades-long music career. "Lucky" was released on August 8, 2000, and instantly rose to the top of the charts. It was the second single released from her beloved second studio album, "Oops!... I Did It Again" and described the heartache and loneliness of one particular starlet.