They're the rocker boyfriends of fashion idols Paris Hilton and Nicole Richie, and now "Good Charlotte's" Madden brothers, Benji and Joel, are busy designing the goods! "Extra" goes inside Madden fashions, and correspondent Alison Waite got the first look at the brothers' hot new line.

Nicole and Paris joined their men at the opening of the Madden's flagship store, DCMA Collective, off of L.A.'s trendy Melrose Avenue. Benji talked about fashionista Paris' input, saying, "She's very supportive and she also likes it... that makes me feel good... you want the people you care about to be into what you're doing."

Benji is also feeling good about his role as "Uncle" to Nicole and Joel's baby, Harlow. "I have changed diapers," says Benji. "Need a babysitter? I will cancel everything. I love it."