Update 7.13.12: One of our readers Frances spied this dress as the same one in her closet, and kindly corrected me as to the Real Deal designer, by Etoile Isabel Marant. Thanks Frances! Info listed below

It must be genetic, because Steffy is becoming the utmost voice of reason…of everything and for everyone. Hopefully it’s just a phase. Thankfully she hasn’t lost her wild side when it comes to her fashion sense though. That was so cliche wasn’t it? Anyways, I can’t nail it every time. I think I’m pretty close to nailing the Real Deal here with the dress though, but again…I’m a little off. The dress Steffy is wearing shows more of a scoop neck and back, with black piping. The one I am showing below from musician, songstress Lily Allen’s label ‘Lucy in Disguise’ (cute name) has some slight deviations. Could possibly be from the same line. I’ve also included a version from Zac Posen’s more affordable line called Z Spoke, because, well, I just really like Zac Posen, and the dress.