She says it's not planned, but just how she has changed naturally:
"I think that when you grow as a person, you grow as an artist, it's inevitable that's gonna happen. I do feel comfortable in my skin. The body's a beautiful thing and it's all in the way that you carry yourself."
'I was trying to be sexy'
Britney has plans to do other films in the future, but has confirmed that she'll be appearing in Austin Powers 3.
She found it hard to act alongside comedian Mike Myers.
"I was trying to be sexy and do my thing and he was in character the whole time so it was really hard for me to play my part."