Miley Cyrus has slammed Katy Perry on Twitter.
The pair locked lips when Miley performed in Los Angeles recently, but Katy said on Australian TV earlier this week she pulled away when 'Wrecking Ball' star tried to take it further, saying: "God knows where that tongue has been. We don't know! That tongue is so infamous!"
Miley, 21, hit back on Twitter today, slamming notorious ladies man John Mayer, who recently split with Katy.
She wrote: "Girl if ur worried abt where tongues have been good thing ur ex boo [boyfriend] is ur EX BOO cause we ALL know where THAT [tongue] been (sic)"
Trying to soften the blow, Miley then added: "Dontchyouuuu act like you didn't lurvvvvv it @katyperry (sic)"
After their kiss on February 22, Katy shared an aftermath photograph, which features the '4x4' singer with her mouth hanging open in shock and Katy covering her mouth with her hand, and captioned it: "And after! I adore you @Miley Cyrus."
Katy, 29, and John Mayer, 36, split last month, blaming their conflicting schedules, but since then friends have accused the guitarist of "sketchy" behaviour.
The 'Gravity' star has been known as a ladies' man and has previously been linked to Jennifer Aniston, Taylor Swift, Jessica Simpson, Jennifer Love Hewitt, Vanessa Carlton, Cameron Diaz and Rashida Jones.
In a separate report, Katy is apparently planning to give Miley Cyrus "the biggest spanking" when she sees her, in response to a dig about her ex-boyfriend earlier today.
Katy responded: "@MileyCyrus Oooo gurrrl I'm gonna give you the BIGGEST spanking when I see you in the UK bb!"
Katy is currently in Australia on a promotional tour for her latest album 'Prism', while Miley is in the US on the first leg of her Bangerz Tour, which will head to Europe later in Spring.