The singer-turned-actress said that the pressure from record bosses for her to keep up with the trends got too much.
She told The New York Post: 'I wasn't happy, and I don't think [the record company] was particularly happy.
'I wasn't interested in going into the studio and singing about shoes and boys and, you know, dealing with whatever hot producer-of-the-week they wanted to have me work with.'
She admitted that she's now trying to move away from her cutesy image.
'People see me as a sweet person and I'd much rather people say that of me than anything else. But it has its limitations,' she explained.
'I'd rather people say, 'Wow, she's an actress and musician' than 'Oh, she does all those cute movies'. I need to challenge myself so people will say, 'Wow, I didn't expect that. Cool'.'