The tennis legend appeared during "Not Like Us," which fans interpreted as another jab at Drake.
Social media users declare "game over" after Lamar's bombastic halftime set.
"But I'm Doja—!" the star cuts in during the ad, which celebrates the brand's everyday customers.
SZA, Samuel L. Jackson, Serena Williams and Mustard all made cameos during the performance.
The rapper's 12-minute performance included his Grammy-winning song "Not Like Us."
The star will join Kendrick Lamar on stage at Caesars Superdome midway through the big game.
Swift was shown on the stadium screen at the Superdome, seated next to Ice Spice.
The Louisiana native played a piano designed by local artists for Sing for Hope.
Donnie Wahlberg, Casey Affleck, Jeremy Strong and Bill Belichick also star the spot.
The Grammy winner’s live interpretation marks the fifth time the Black national anthem has been performed at the big game.
