The new leg brings the singer's itinerary to a total of 27 cities, running from mid-July through early September. The full schedule is included below.

Released in April, "Dignity" is Duff's third solo album, and follows 2005's "Most Wanted." Duff has a hand in writing her own songs for the first time, a fact that stirred up a bit of controversy when many reviewers assumed the album's track "Gypsy" to be a slap at Nicole Richie, who is currently dating Duff's ex-boyfriend, Good Charlotte frontman Joel Madden. She later told USA Today that the song was about the pain of her parents' recent split, and not her own break-up.

Duff is scheduled to appear in a pair of movies this year. Aside from providing her voice to the animated feature "Foodfight," she'll co-star with John Cusack in "War, Inc." an action movie about a hit man assigned to kill an oil minister.

Cusack lavished praise on Duff in a recent interview with MTV Movie News, calling her "a great actress. I just spent the entire fall with her and she was a revelation every day. I don't think people know that yet, but they're gonna."