the first time i saw her was in Sisterhood of traveling pants and when i saw her in gossip girl i was so excited.

Knew Blake from Sisterhood, knew Leighton from guest spot on Veronica Mars, etc.

Blake Lively - Sisterhood of the travelling pants
Taylor Momsen - How the Grinch stole Christmas and Spy Kids

Same as Nat and well Chace - The Covenant

I knew about Blake from Sisterhood of the Traveling Pants.

I saw Leighton in a couple eps of Veronica Mars.

the grinch!!!

Mainly Blake from Sisterhood of the Traveling Pants
But I'd seen Penn in John Tucker Must Die (lol)

Taylor Momsen - The Grinch & Saving Shiloh :)
Blake Lively - The Sisterhood Of The Traveling Pants 1 & 2 :)

same as Natasha and Leighton from House Md guest apperance

from Veronica Mars and House MD

The Covenant.

I assume you mean the actors and not the characters. I first saw Leighton on House md and then Blake on "The Sisterhood Of The Traveling Pants 1".

I saw Taylor in how the grinch stole christmas!

And Leighton and Taylor!!! I saw Blake in The Sisterhood of The Travelling Pants,Saw Leighton in House,Surface,Veronica Mars,Saw Chace in The Convenant,Saw Penn in Drive-Thru and The Bedford Diaries

i saw penn in John tucker must die also.

i saw penn in john tucker must die too :>

I saw her in Sister Hood of the Traveling Pants and Penn in John Tucker must die. I also saw Taylor, but didn't realize it was her until I started watching Gossip Girl.

I saw her in Accepted and Sisterhood.

Covenant

sisterhood of the traveling pants and taylor in the grinch :P

I knew all of them except ed....

taylor grinch, leighton 9 simple rules, dan john tucker must die, chase covenant, jessica thats so raven LOL and blake sister hood, but i chose blake, cause i know her more!

John Tucker must die's one of my fav movie.

Taylor was the only one i'd seen

Goodness.
Blake- The travling pants.
Penn - John Tucker must die
Leighton - she guest starred on House M.D [though I didn't know it was her till a little afterwards...]
Tayler - How the Grench stole christmas [I didn't recongize her at first. LOL]

Penn- I actually saw him in "The Mountain" first. Oh man do I miss Shelley and Michael. Anyways, then he was in Bedford Diaries and then John Tucker Must Die.

Jenny- Technically she was the first one I saw (the Grinch), but I did not know who she was.

Blake- The sisterhood of the Traveling Pants. She is by far the most well known by people.

Chace- The Covenant, but I did not know who he was until Gossip Girl.

I first saw Blake in Sisterhood.

Sisterhood of traveling pants

so blake is the most popular one... i knda guess that.

i knew serena, blair and nate

Sisterhood

in the sisterhood of travelling pants :) and i saw taylor too, in how the grinch stole christmas, but i didn't know who she was.

Blake Lively - Sisterhood of the travelling pants

Nuff said.