Perry's been promoting his new book Rocks: My Life In And Out Of Aerosmith which launched last month via Simon & Schuster. And he reveals one of the reasons he wrote the autobiography was to put the record straight about the pair's relationship.

He tells Smashing Interviews: "It's pretty much what it is. You can love your brother, but you don't have to like him. We have our ups and downs. He'll say stuff in the press and I'll think, 'What the hell is he talking about?' Next time I see him, it's all hugs and kisses.

"We know the band is bigger than our ups and downs. If anything, it's been a learning process in how to deal with each other's personalities. That's one of the reasons I wanted to write the book because people hear stuff about Joe and Steven not getting along."