The pair performed their collaboration "You All Over Me" at an Eras Tour show in Chicago.
The pop star just closed out her Eras trek in December.
"Her stadiums make my shows look like clubs," the "Espresso" singer said.
"I got to see her and we got to catch up," Perry said after attending Swift's Sydney concert last year.
The comedian caught a total of 22 concerts on the historic trek.
Check out these pictures to burn -- into your memories.
The tight end also shared the No. 1 place he won't be taking the pop star on a date.
As it turns out, so dope that it inspired the Black Eyed Peas' upcoming Las Vegas residency.
The pop star and retail giant teamed up for exclusive versions of "The Tortured Poets Department: The Anthology" and her official Eras Tour book.
The pop superstar performed at the city's Rogers Centre on Nov. 22.
