By Emma Wilson Britney Spears could make up to £80 million if she joins OnlyFans after quitting music, an expert has claimed. The pop icon announced in January that she would “never” make another album, after rumours began to swirl that she was heading back into the recording studio with reports Charli XCX was writing songs for Britney. “Just so we’re clear most of the news is trash !!!” the Toxic hitmaker posted on Instagram. “They keep saying I’m turning to random people to do a new album … I will never return to the music industry !!!” After ruling out a return to music, OnlyFans manager Ce…