A day after Jay-Z and Beyoncé’s first child made her debut on this planet, Jay posted a song that will surely go down as the 2012’s most “awwwwww!”-inspiring rap track. Welcome to Earth, Blue Ivy Carter, and congratulations on the beginning of your recording career. Jay-Z’s caption: “Life just got REALLY good.” “Baby I paint the sky blue / My best creation was you,” says a very happy man. This is wonderful. Hear it at Hov’s site Life + Times.