The singer, 41, is thought to have mad the dig as she incorporated a playful on-stage segment featuring several of her high-profile former partners.
Perry was headlining the O Son do Camiño festival in Santiago de Compostela on Thursday when a giant iPhone graphic appeared on screen during a performance of her 2020 hit Never Really Over.
The visual showed a series of incoming calls from former partners and rumoured flames, including Diplo, initials believed to refer to John Mayer, Russell Brand and Orlando Bloom.
The moment comes a year after Perry and Bloom ended their engagement following almost a decade together, and amid continuing attention surrounding her relationship with former Canadian prime minister Justin Trudeau.
The singer remains one of pop music's most recognisable stars thanks to hits including Firework, Roar, Teenage Dream, California Gurls and Dark Horse.
During the performance, Katy ignored the calls from her former partners before eventually answering a call labelled "JPJT" – initials widely understood to refer to Justin Pierre James Trudeau.
The visual quickly attracted attention across social media, with fans interpreting it as a light-hearted nod to Perry's romantic history and her new relationship.
But the singer did not directly address the segment during the show.
Perry and Bloom first became romantically linked in 2016 after meeting at a Golden Globes afterparty.
After a brief split in 2017, they rekindled their relationship the following year and announced their engagement on Valentine's Day in 2019.
The former couple welcomed daughter Daisy Dove in August 2020 and remained together for several years before reports emerged in June 2025 that they had separated amicably.
Since their split, they have continued to co-parent Daisy.
Earlier in June, Perry and Trudeau made their red-carpet debut together at the Tribeca Film Festival, further fuelling interest in the relationship.
The singer is currently continuing her international live performances while balancing a period of renewed public attention surrounding both her personal life and her music career.
Her appearance in Spain formed part of a busy schedule of festival and concert dates, with Never Really Over proving one of the standout moments of the evening.
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