![John Mayer Celebrates 40th Birthday in Brazil!: Photo 3973805 | John Mayer Photos | Just Jared: Entertainment News John Mayer Celebrates 40th Birthday in Brazil!: Photo 3973805 | John Mayer Photos | Just Jared: Entertainment News](https://cdn.justjared.com/wp-content/uploads/2017/10/mayer-bday/john-mayer-birthday-brazil-01.jpg)
John Mayer Celebrates 40th Birthday in Brazil!: Photo 3973805 | John Mayer Photos | Just Jared: Entertainment News
![John Mayer leaves George Clooney's birthday party at Bungalow 8. TMZ gave him this tshirt that said "MR Douchebag" on it, but Stock Photo - Alamy John Mayer leaves George Clooney's birthday party at Bungalow 8. TMZ gave him this tshirt that said "MR Douchebag" on it, but Stock Photo - Alamy](https://c8.alamy.com/comp/C0E3TN/john-mayer-leaves-george-clooneys-birthday-party-at-bungalow-8-tmz-C0E3TN.jpg)
John Mayer leaves George Clooney's birthday party at Bungalow 8. TMZ gave him this tshirt that said "MR Douchebag" on it, but Stock Photo - Alamy
![John Mayer USA on X: "“I loveee my friends who got me this watermelon cake filled with JM on my birthday earlier this August. I bet any of ur friends have done John Mayer USA on X: "“I loveee my friends who got me this watermelon cake filled with JM on my birthday earlier this August. I bet any of ur friends have done](https://pbs.twimg.com/media/EDRmuWkU0AAv8uZ.jpg)
John Mayer USA on X: "“I loveee my friends who got me this watermelon cake filled with JM on my birthday earlier this August. I bet any of ur friends have done
![John Mayer leaves George Clooney's birthday party at Bungalow 8. TMZ gave him this tshirt that said "MR Douchebag" on it, but Stock Photo - Alamy John Mayer leaves George Clooney's birthday party at Bungalow 8. TMZ gave him this tshirt that said "MR Douchebag" on it, but Stock Photo - Alamy](https://c8.alamy.com/comp/C0E3RK/john-mayer-leaves-george-clooneys-birthday-party-at-bungalow-8-tmz-C0E3RK.jpg)
John Mayer leaves George Clooney's birthday party at Bungalow 8. TMZ gave him this tshirt that said "MR Douchebag" on it, but Stock Photo - Alamy
![John Mayer Celebrates 40th Birthday in Brazil!: Photo 3973808 | John Mayer Photos | Just Jared: Entertainment News John Mayer Celebrates 40th Birthday in Brazil!: Photo 3973808 | John Mayer Photos | Just Jared: Entertainment News](https://cdn.justjared.com/wp-content/uploads/2017/10/mayer-bday/john-mayer-birthday-brazil-04.jpg)
John Mayer Celebrates 40th Birthday in Brazil!: Photo 3973808 | John Mayer Photos | Just Jared: Entertainment News
![No Champagne, Papi: John Mayer Gave Up Drinking After Embarrassing Himself At Drake's 30th B'Day Party THEN Suffering Six-Day Hangover - Bossip No Champagne, Papi: John Mayer Gave Up Drinking After Embarrassing Himself At Drake's 30th B'Day Party THEN Suffering Six-Day Hangover - Bossip](https://bossip.com/wp-content/uploads/sites/28/2018/11/john-mayer-drake-e1542121957528.jpg?strip=all&quality=80)