The long, blonde extensions, the party girl image, and now even the clothing--like these black thigh highs that both girls wore this week.
Lohan is 23, but Momsen is only 16, so isnt' she a little young for the Joan Jett meets Courtney Love look?
It's all probably part of the star's rock image, as Momsen is the lead singer in her band, "The Pretty Reckless."
(p.s. Incidentally, co-stars Leighton Meester and Ed Westwick also have bands/albums in the works.)