As multimedia momentum goes, no one need teach 19-year-old Hilary Duff a thing. For the past decade, she has built a career that began on TV, peaking in 2001 with her title role in Disney's 65-episode

As multimedia momentum goes, no one need teach 19-year-old Hilary Duff a thing. For the past decade, she has built a career that began on TV, peaking in 2001 with her title role in Disney's 65-episode "Lizzie McGuire," making her a name brand among tweens.

Two years later, she recorded a full-length studio album, "Metamorphosis," which catapulted to No. 1 on The Billboard 200, and the single "Come Clean" hit The Billboard Hot 100's top 40. The project sold 3.7 million copies -- and a MTV star was born.

With her upcoming "Dignity," due April 3 via Hollywood, Duff is coming out with the majesty of a high-class debutante. Duff co-wrote all songs on the album with A-lister Kara DioGuardi, including the uptempo single "With Love." The artist is also promoting her new Elizabeth Arden fragrance, With Love, in addition to a clothing line, Stuff by Hilary Duff, available at mass-market retailers Wal-Mart, Kohls and Target.

"I know how lucky I am, but I've worked hard," Duff says. "Who could complain? I've traveled the world multiple times with so many rewards."

For the new album, Duff insisted on being more involved. "I knew I couldn't do it myself, but working with Kara allowed me to talk about things on my mind. It was one big therapy session." During the songwriting process, Duff endured the full scope of a relationship -- true love, doubt, breakup and resolution -- all of which play out during the course of the set's 14 tracks.

"People don't know a lot about my life, but these songs are self-explanatory. It was crazy to be in the midst of a loving relationship, then not knowing why you're still there, then not being in it. I cover these emotions and the feeling of being in the dark," she says.

Even so, the melodic template of the album is refreshingly dance/pop. "It's so different from my other albums, which were pop/rock," Duff says. "I didn't necessarily plan the album to sound like this, but it was so easy to write to."

Hollywood has a flush of promotion in place to ensure that "Dignity" reconnects fans who have grown up alongside the teen. Duff is co-hosting MTV's "TRL" the week before release, in addition to a three-episode reality special following promotion in Italy, Madrid and London. Yahoo also sent a crew to record a multi-episode series surrounding the project, focusing on Duff's musical maturity and refined womanly image. TV includes "Good Morning America," "Jimmy Kimmel Live" and "The Ellen DeGeneres Show," as well as commentary on VH1's "Maxim's Top 100" countdown. Duff is also a spokeswoman for Verizon's Pink Chocolate phone.

Hollywood GM Abbey Konowitch predicts that Duff is a bull's-eye for success with a sound that addresses pop radio's "overlooked middle." He says, "She offers balance between hip-hop and rockóand she's already an iconic pop star crossing into a new generation, versus someone who simply has a nice song for radio."

"Dignity" will also be available as a special edition that includes a DVD interview with Duff discussing her comprehensive career path. "It's a chance for fans to see that she is for real and what happens as a woman grows up," Konowitch says.

Buena Vista Music Group chairman Bob Cavallo adds, "This record is pivotal and Hilary delivered. It's the first time she has co-written, and she's gone in a new musical direction. Her new look is reflective of all of this -- confident, beautiful and edgy."

Meanwhile, radio is warming to "With Love," which debuted at No. 37 in early March at top 40 radio. Among the first stations to add the song is powerhouse top 40 WHTZ (Z100) New York. PD Sharon Dastur says, "My first reaction watching the video for 'With Love' was, 'This is exactly the kind of song she should be doing.' Hilary's more mature look completed the package. Her sound and image are a natural progression."

Duff will support "Dignity" with a headlining tour, while she plans for further branding, including a line of eyeglass wear and youthful bedroom furniture to enhance Stuff by Hilary Duff. She also wants to develop "fashion-forward" clothing attuned to her age group.

But most of all, Duff hopes to maintain stance as a role model, based on the title track of her new project. "I don't insinuate that I have a ton of dignity -- come on, I'm 19 -- but it's something I strive to possess and important in how you treat others, how you handle your job and treat yourself," she says. "It's also something that can be easily lost. I hope I can hold on to dignity as I move forward."