Leo - aka Leo the Lion - performed vocals on Dry Your Eyes and appeared on tour with The Streets - but Skinner has gone to the effort of claiming that he was not a proper member of the group on his blog.
Writing on his blog, Skinner asserted: "Leo the Lion wasn't in The Streets. He was a session singer on a few album tracks. He also sang on tour for a bit. He wasn't part of any songwriting."
And Leo saw red when the post came to his attention, launching into an angry Twitter tirade.
"YOU ARE A TOTAL DISGRACE..!! HOW F**KING DARE YOU...SESSION SINGER..!!??? http://mikeskinner.so/ #EGOTISTICAL #A**EHOLE
"Explain to the fans why we haven't spoken for years... You refuse to be happy for me.. After all these years... You gonna post that..!!!!!"
And he later added: "It's just incredible how some people can never ever want others to succeed.."
Then: "Sincere apologies to all the fans for going off like that..!! Love as always.. #LetsKeepItMoving #SayNoMore"