this is MAC A Perfect Day Lipstick, it was just released with the Naturally Collection.
When I got home after purchasing it, I found that I have about 10 lipsticks that look the same, at least in the tube... I might do comparison swatches, but right off the top of my head MAC Creme de Nude seems to be fairly similar. But I haven't swatched them side by side yet, so maybe not, we'll see!
A Perfect Day is a beige nude and has an Amplified finish which means it's a pretty opaque cream and will cover your lips with color almost completely. Sometimes, I feel, it even covers them too much and I feel like I have a bit of a paste on my lips, but if you just dab the color on, instead of running the tube left and right, it's less of a thick layer. Or you could apply it with a brush, that will work perfectly, too!
Anyway, A Perfect Day are my Lips of the Day!