![Elton John on Twitter: "#HappyBirthday to Billie Jean King, the tennis champ who inspired Elton's hit song, 'Philadelphia Freedom'. 🎂🎉 https://t.co/3vzK7dqTH2" / Twitter Elton John on Twitter: "#HappyBirthday to Billie Jean King, the tennis champ who inspired Elton's hit song, 'Philadelphia Freedom'. 🎂🎉 https://t.co/3vzK7dqTH2" / Twitter](https://pbs.twimg.com/media/DPPBrqkX0AArc8t.jpg)
Elton John on Twitter: "#HappyBirthday to Billie Jean King, the tennis champ who inspired Elton's hit song, 'Philadelphia Freedom'. 🎂🎉 https://t.co/3vzK7dqTH2" / Twitter
![Billie Jean King on Twitter: "Four decades of friendship and we're not done yet! Happy birthday to my dear friend, Elton John! https://t.co/NTcB3KaWeQ" / Twitter Billie Jean King on Twitter: "Four decades of friendship and we're not done yet! Happy birthday to my dear friend, Elton John! https://t.co/NTcB3KaWeQ" / Twitter](https://pbs.twimg.com/media/D2gXwe6XgAAKwg0.jpg)
Billie Jean King on Twitter: "Four decades of friendship and we're not done yet! Happy birthday to my dear friend, Elton John! https://t.co/NTcB3KaWeQ" / Twitter
![Elton John and good friend Billie Jean King look like twins at Las Vegas AIDS event | Daily Mail Online Elton John and good friend Billie Jean King look like twins at Las Vegas AIDS event | Daily Mail Online](https://i.dailymail.co.uk/i/pix/2016/10/12/00/394E321E00000578-3833507-image-m-4_1476227834044.jpg)
Elton John and good friend Billie Jean King look like twins at Las Vegas AIDS event | Daily Mail Online
![530 Smash Hits With Billie Jean King And Elton John Stock Photos, High-Res Pictures, and Images - Getty Images 530 Smash Hits With Billie Jean King And Elton John Stock Photos, High-Res Pictures, and Images - Getty Images](https://media.gettyimages.com/id/117933701/photo/billie-jean-king-and-elton-john-at-the-advanta-wtt-smash-hits-tennis-event-at-the-bren-center.jpg?s=612x612&w=gi&k=20&c=ZogoXZim9-JGD88CnE93IBCHLPVGzDLlc_Crzfjb3PQ=)
530 Smash Hits With Billie Jean King And Elton John Stock Photos, High-Res Pictures, and Images - Getty Images
![530 Smash Hits With Billie Jean King And Elton John Stock Photos, High-Res Pictures, and Images - Getty Images 530 Smash Hits With Billie Jean King And Elton John Stock Photos, High-Res Pictures, and Images - Getty Images](https://media.gettyimages.com/id/613848092/photo/recording-artist-sir-elton-john-and-former-tennis-player-billie-jean-king-attend-the-live.jpg?s=612x612&w=gi&k=20&c=RTSvr8imacRkisa-TWiR3bT1dSL5auJSClPuXzHB2So=)