The Insider.com

Even the stars love a good reasonably-priced fashion collaboration -- which is why celebs like Amy Smart and 12-year-old Mad Men star Kiernan Shipka are so enthusiastic about the Mad Men for Banana Republic collection -- available in stores and online now!

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"I love the Joan character because it's super hourglass, and feminine and fitted," Amy says about her favorite fashion looks from the show at last night's Banana Republic Mad Men Spring Collection Launch in Los Angeles.

Exclusive First Look: Banana Republic Goes 'Mad Men'

"And it's always fun to see January [Jones], the Betty character, and see the fashion she rocks."

Clad in a pink Banana Republic dress from the new Mad Men collection, Amy also chatted about her own television project Shameless.

Banana Republic and 'Mad Men' Part Two

"Well I like Jasmine [her character in the show] because she sort of comes across just like [any other] mom, but underneath she's just percolating with so much curiosity and boredom that she just wants to liven her life up and break out of the norm," she explains. "Definitely the second season, she's going for it -- and she goes down the rabbit hole," she teases.

Check out the video to see Kiernan rocking her own dress from the collaboration and also to hear what Janie Bryant, the Emmy award-winning costume designer for Mad Men, thinks is the "staple piece" of any woman's wardrobe.