The perfect shimmery pink? I just found it -- and it's Estee Lauder Pure Color Gloss in Star Pink.
The pale pink gloss imparts the most gorgeous sparkle -- and it's one of the first pastels I've found that actually looks good on its own. Usually I find I have to layer pale pink glosses over deeper colors to really get the shade I'm after -- but with this one, I can just slick it on my pout and head out the door!
While Estee Lauder Pure Color Gloss in Star Pink is no longer available, you can find other colors for $24 each at sephora.com.