- Katy Perry Praises Lady Gaga After Attending ‘Mayhem’ Show: ‘So Proud of You’ billboard.com
- Lady Gaga Brings Divine Mayhem to Mexico in Triumphant Return: ‘This Time it’s Not the End, it’s the Beginning’ billboard.com
- Katy Perry Praises Lady Gaga After Attending ‘Mayhem’ Tour in Mexico City: ‘So Proud of You’ People.com
- Lady Gaga, Mexico City, review: more brilliantly bonkers than Katy Perry in space The Telegraph
- Katy Perry Attends Lady Gaga Concert in Mexico City: ‘So Proud of You’ Rolling Stone