The adorable 7-year-old played Cindy Lou Who in How the Grinch Stole Christmas.
9-year-old Momsen was allowed a little peach gloss for the We Were Soldiers premiere.
Momsen ditched her baby blond Cindy Lou Who strands in favor of chestnut brown locks.
She landed the role of Gossip Girl's Jenny Humphrey with beachy blond waves.
Momsen channeled a Manhattan sophisticate in a blunt shoulder-length bob and silvery shadow.
An edgy take on evening: winged retro liner and an undone updo.
Taylor hit the premiere of Sex Drive with a choppy '70-style shag.
Momsen wore her Debbie Harry-inspired platinum locks in soft curls.
The Pretty Reckless frontwoman declared her rock and roll allegiance with a punked-out layered cut.
Taylor was announced as the face of Madonna's Material Girl clothing line-and sported a very Madge beauty mark above her top lip.
