The Madden brothers (pictured in West Hollywood on Feb. 11) burst onto the music scene in 2002 with their punk rock band Good Charlotte, with hits such as "Lifestyles of the Rich and the Famous" and "I Don't Wanna Be in Love." Their songs lauded the single life, but they didn't exactly practice what they preached: Benji has dated actress SophieMonk, heiress ParisHilton and HughHefner's ex HollyMadison, while Joel infamously dated a teenage HilaryDuff from 2004 to 2006. In 2010, Joel married NicoleRichie, with whom he has daughter Harlow, 5, and son Sparrow, 3. Benji and Joel own a clothing line, DCMA Collective, together, and in January they announced they're returning to music with a band called -- what else? -- The Madden Brothers. But the two aren't always a harmonious pairing: In 2007, Joel told Seventeen, "We fight a lot! Over dumb stuff, like, he'll borrow something of mine and then lose it. Then we'll sit down to write and I'll still be thinking about the fact that he lost my favorite shirt."