Katy Perry, John Mayer Baby, You're My Fireworks!

7/5/2015 9:03 AM PDT

Katy Perry, John Mayer--Baby, You're My Fireworks!

EXCLUSIVE

Katy Perry and John Mayer made the crowd roar at the Grateful Dead concert in Chicago Saturday night when they cuddled out loud.

They announced their split back in March but, as they say, nothing stays the same.