![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 Billie Jean King at the 18th annual World Team Tennis (WTT) Smash Hits presented by GEICO, a charity tennis event benefiting the Elton John AIDS Foundation and the Washington Elton John and Billie Jean King at the 18th annual World Team Tennis (WTT) Smash Hits presented by GEICO, a charity tennis event benefiting the Elton John AIDS Foundation and the Washington](https://c8.alamy.com/comp/2MW404K/elton-john-and-billie-jean-king-at-the-18th-annual-world-team-tennis-wtt-smash-hits-presented-by-geico-a-charity-tennis-event-benefiting-the-elton-john-aids-foundation-and-the-washington-aids-partnership-held-at-bender-arena-at-american-university-prior-to-the-tennis-match-players-attended-a-vip-reception-and-participated-in-a-live-auction-washington-dc-111510-2MW404K.jpg)
Elton John and Billie Jean King at the 18th annual World Team Tennis (WTT) Smash Hits presented by GEICO, a charity tennis event benefiting the Elton John AIDS Foundation and the Washington
![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
![24 4th Annual Rfk Pro Celebrity Tennis Tournament Stock Photos, High-Res Pictures, and Images - Getty Images 24 4th Annual Rfk Pro Celebrity Tennis Tournament Stock Photos, High-Res Pictures, and Images - Getty Images](https://media.gettyimages.com/id/156126915/photo/athlete-billie-jean-king-and-musician-elton-john-attend-fourth-annual-robert-f-kennedy-pro.jpg?s=612x612&w=gi&k=20&c=rdAD48vJnNb9Q-s5Lt5JnePq_89dq-4vRsswVmv2gvs=)
24 4th Annual Rfk Pro Celebrity Tennis Tournament Stock Photos, High-Res Pictures, and Images - Getty Images
Billie Jean King - My dear friend Elton John wore the Philadelphia Freedoms uniform well, don't you think? 🎾 📷: Terri O'Neil #ThrowbackThursday | Facebook
![Elton John and tennis star Billie Jean King could pass for twins as they share a high five | The Sun Elton John and tennis star Billie Jean King could pass for twins as they share a high five | The Sun](https://www.thesun.co.uk/wp-content/uploads/2016/10/nintchdbpict000273784297-e1476182381264.jpg)
Elton John and tennis star Billie Jean King could pass for twins as they share a high five | The Sun
![File:Mylan Executives Heather Bresch and Robert J. Coury with Elton John and Billie Jean King.jpg - Wikimedia Commons File:Mylan Executives Heather Bresch and Robert J. Coury with Elton John and Billie Jean King.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/2/22/Mylan_Executives_Heather_Bresch_and_Robert_J._Coury_with_Elton_John_and_Billie_Jean_King.jpg)
File:Mylan Executives Heather Bresch and Robert J. Coury with Elton John and Billie Jean King.jpg - Wikimedia Commons
![Billie Jean King on Twitter: "Elton John has announced that the final two shows of his Farewell tour in North America will take place at Dodger Stadium next year. I'll never forget Billie Jean King on Twitter: "Elton John has announced that the final two shows of his Farewell tour in North America will take place at Dodger Stadium next year. I'll never forget](https://pbs.twimg.com/media/E4lz6ELXwAgq3IM.jpg)