Britney Spears graces the latest cover of Harper's Bazaar and in the accompanying interview, she talks about her upcoming tour, her biggest fashion mistake and why she thinks Justin Bieber is adorable.

When asked about her new album, Femme Fatale, Spears revealed, "I've worked so hard on this album, so it's really refreshing. I feel like I'm drinking a tall glass of homemade sweet tea on a really hot, beautiful day."

The 29-year-old singer also talked about her Femme Fatale tour. "I love to dance, so it's very exciting. The tour rehearsals have been going really well. I think it will be my best show yet."

More excerpts after the jump.