She’s shaking it off.

Katy Perry was spotted happily dancing to Taylor Swift’s diss song about her at the Eras Tour in Sydney, Australia, on Friday night.

The “California Gurls” singer gleefully bobbed her head while watching the concert from a VIP box as Swift belted out her 2014 hit “Bad Blood” onstage, according to videos on social media.

Perry, who attended the show with her pal Rita Ora, later linked up with the “All Too Well” singer backstage and posted a photo of their reunion to her Instagram with the caption, “Got to see an old friend shine tonight.”

The song from Swift’s “1989” album was long-rumored to be about her beef with Perry.

Their feud unfolded when Swift, 34, claimed in a 2014 Rolling Stone interview that Perry, 39, had “basically tried to sabotage an entire arena tour” by stealing her backup dancers, leading fans to believe the pop tune was aimed at the “Last Friday Night” singer.

Perry cryptically responded to the dig at the time by tweeting, “Watch out for the Regina George in sheep’s clothing,” referring to the blond bully in the 2004 movie “Mean Girls.”

While tensions between the pop stars remained high for some time, Swift and Perry ended up burying the hatchet in 2019.

The “Dark Horse” hitmaker claimed that year that she was the one to make the first move in righting their relationship.

“It kind of was a process. I sent her a literal olive branch and a note apologizing for my part in all of it when she started her ‘Reputation’ tour,” Perry said in an interview with Australian radio hosts Kyle and Jackie O.

“I just thought she was about to embark on something new and big and needed the support.”

The “American Idol” judge shared that she realized how much they had in common when she was wrapping up her “Witness” tour that year.

“Maybe there’s only five other people in the world that can have the same type of conversations and understand where we’re coming from and that we should celebrate our commonality and our friendship and be able to be there for each other,” she said.