Britney Spears got her fans fired up on Tuesday when she appeared to 'throw shade' at Katy Perry following a comment she made at the Grammys on Sunday night about shaving her head. Britney, 35, took to Instagram and Twitter to share a bible verse, which many believe was aimed at the singer. The post, which shows a pair of hands framing the sun in a heart shape, read: "Her mouth speaks from that which fills her heart. Luke 6:45." It didn't take long for fans to react to the cryptic message. "What a classy way to put someone in their place!!" one wrote, with another added: "She's so humble and discreet. A queen!" Celebrity blogger Perez Hilton added: "QUEEN OF SHADE!"

Britney Spears shared a bible quote with fans - which many believe is aimed at Katy Perry

It comes two days after 32-year-old Katy seemingly referenced Britney's now-infamous head shaving incident in 2007, when she endured a very public and painful breakdown. Katy, who was at the Grammys, was being asked by Ryan Seacrest about the gap between her last album, , in 2014, and her new song , which was released on 10 February this year. "That's called taking care of your mental health," Katy replied. "How did that go?" host Ryan then asked her. "Fantastic. And I haven't shaved my head yet," she added.

Katy Perry pictured on the red carpet at the 2017 Grammys

Katy also discussed her upcoming new album. "I'm so proud of it," she said. "I think it's a new era of me. I call it an era of purposeful thought. All of my songs have always had layers to them. I used to be kind of the queen of innuendos and I woke up and educated myself more, and I think I’m maybe more the queen of subtext and I think [] is a song that starts conversations. And I think we maybe need to listen to each other."

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Meanwhile, it has been confirmed that Katy will perform at this year's Brit Awards on 22 February. The US pop star will take to the stage at the O2 at next week's event alongside the likes of Ed Sheeran, Robbie Williams and Little Mix. "I'm excited to come back to one of my favourite countries, where most of my favourite musical influences come from. After three years, I'm excited to return to the Brits' stage to kick off a new era of purposeful pop," she said.

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