Could the Bad Blood between Katy Perry and Taylor Swift finally be behind them?
Roar singer Katy has certainly hinted that that's the case.
The pair are thought to have had a frosty relationship for years, although they were friends back in the day.
But now Katy appears to have extended an olive branch.
Chatting to fans on Twitter, one asked the star if she would ever work with Taylor.
And Katy replied that she would!
The rumours of the rift between the pair became public a couple of years ago, when Taylor suggested that her 2014 song Bad Blood was about another female artist who she had fallen out with.
While not naming Katy, she said of a rival pop star: "She basically tried to sabotage an entire arena tour. She tried to hire a bunch of people out from under me."
Katy seemed to respond by referencing Mean Girls' villain on Twitter.
Katy hasn't confirmed that the tweet was from her - and Taylor hasn't commented - but fingers crossed it's all true and Katy and Tay are back on friendly terms.