I'd say
Scarlett Johansson
http://www.quality-images-web.com/scarlett_johansson/scarlett_johansson_29.jpg
Katy Perry
http://cdn.wwtdd.com/wp-content/uploads/2009/07/167275_katy_perry_esquire_magazine_photoshoot-1_122_442lo.jpg
Georgia Salpa
http://solochicasybikinis.com/wp-content/gallery/georgia-salpa/georgia-salpa-arthur-carron-shoot-07.jpg
Christina Hendricks
http://www.nerve.com/files/uploads/ch1.jpg
Lindsay Lohan
http://galleries.celebrityprofits.com/galleries/cxxx/celebs/Lindsay_Lohan/02/05.jpg

Which celebrities do you think have the best tits?

Halle Berry
http://www.fhm.com/girls/covergirls/halle-berry

MARIAH CAREY

http://img121.imagevenue.com/img.php?image=72079_eertz_122_487lo.jpg#

http://img129.imagevenue.com/img.php?image=72305_lolllkk_122_324lo.jpg

Kat Dennings should get a nod
http://4.bp.blogspot.com/-3w4Y-flNbcM/Tcofs2f2GWI/AAAAAAABHXw/jbxLJkDT7eE/s1600/11.jpg

Katy Perry for sure. Check out her appearance on Howard Stern.

i think Katy Perry does personally, but all the ones said so far are awesome too.

Eva Amurri
http://3.bp.blogspot.com/-Fx0SSzul06E/TVz7PAL-RvI/AAAAAAAAEv4/TFR3Xsu-01k/s1600/eva+amurri+nipple+slip.jpg

Erika Christensen
http://www.pollsb.com/photos/o/343580-erika_christensen_bikini.jpg

Jennifer Connelly
http://amog.com/wp-content/uploads/2010/03/jennifer_connelly.jpg

Carla Gugino
http://thedailycap.com/wp-content/uploads/2011/03/Carla-Gugino-7.jpg

Elizabeth Hurley
http://www.topstars.pl/wp-content/uploads/2009/01/hurley.jpg

Diora Baird
http://cdn.uproxx.com/assets/images/406/406_738a90acb50152661624a6038c6d4212.jpg

Serena Williams
http://static.poponthepop.com/images/gallery/serena-williams.jpg

Salma Hayek
http://24.media.tumblr.com/tumblr_lj8yc6TBPL1qg37udo1_400.jpg

Monica Bellucci
http://theblemish.com/images/2008/12/monica-bellucci-cleavage-02-500x754.jpg

Uma Thurman
http://hotbabeblog.com/wp-content/uploads/2009/06/uma_thurman.jpg

Lisa Nicole Carson
http://clutchmagonline.com/wp-content/uploads/2009/07/lisa16.jpg

Kim Kardashian
http://www.goforphotos.com/kim/actress-kim-kardashian-boobs.jpg

Jessica Simpson
http://www.teenrave.org/pics/jessicasimpson.jpg

Christina Aguilera
http://www.picpiggy.com/bank/christina_aguilera_breasts-1253547845.jpg

Rosanna Arquette
http://cache2.allpostersimages.com/p/LRG/27/2773/INWTD00Z/poster/rosanna-arquette.jpg

Jennifer Love Hewitt
http://superstars.my3gb.com/pictures/jennifer-love-hewitt-breast-pictures-3.jpg

Eva Green
http://26.media.tumblr.com/tumblr_lgh1rvFueM1qbjjv2o1_500.jpg

Jennifer Coolidge (That's right - Stifler's mom!)
http://images.askmen.com/photos/jennifer-coolidge/9670.jpg

cheryl cole,kelly brook,jesica simpson,jennifer love hewit mariah carey,halle berry,katy perry!

all great picks

jennifer love hewitt, katy perry, gemma merna.

Great picks, guys. I can't believe I forgot about Salma Hayek. She has amazing breasts.

y is every guy turned on with big tits i simply luv small ones mmmm like zooey deschannel, etc

Katy Perry & Halle Berry.....Silicone Free

I'm with you!

http://fapadores.com/upload/images/zooey-deschanel-23.jpg

I've got nothing against smaller tits. Zoey's fine by me.