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Hilary Duff's Disney princess days are "So Yesterday." These days, she's an actress/singer turned author and mogul who is busy being a full-fledged, fully-functioning adult. (Hear that, Lindsay Lohan!) She's also a hockey wife and expectant mother. So, at the ripe old age of 24 (yes, only 24!), she's managed to make the transition of tween queen to full-fledged adult star pretty seamlessly.

And for that we have this message for the Duffster: Happy Birthday! For those of you youngsters less familiar with Mrs. Mike Comrie, you might be more familiar with the Disney actresses who have followed in the grand Duff tradition. Without Hil, we wouldn't have a business model followed by the likes of Miley Cyrus, Selena Gomez and Demi Lovato, to name a few.

One decade ago, Duff became a household name as the star of "Lizzie McGuire." The show was an instant success with early millennium tweens and launched Duff into mega-fame. Thanks to the show, she was able to transition successfully into movies like "Cheaper By The Dozen" (and its sequel), "Agent Cody Banks" and "A Cinderella Story."

She also released several albums over the years and had hits with tracks like "So Yesterday" and "Come Clean." When some performers in the Disney stable mature, the opportunities begin to slow down, but for Duff that was anything but the truth. She launched a clothing line, became a published author and continued to act with roles on shows like "Gossip Girl." Like her younger counterparts, she became a tabloid fixture thanks to relationships with Aaron Carter (remember that Lindsay Lohan love triangle?) and Joel Madden.

Oh, does all this sound familiar? Having a case of déjà vu? That's because it's the same career arch teen stars currently follow. So, Miley, Selena and Demi, go get your girl Hil a birthday gift. She certainly deserves it!