She's not even two, but Blue Ivy - Beyoncé's precocious daughter with Jay-Z - has become the most talked-about toddler in the world after appearing in a duet with her superstar mother after Beyoncé unexpectedly released her new album on iTunes.

Within minutes of news breaking about the release of Beyoncé's hotly anticipated fifth album, Twitter went into meltdown with the singer and and Blue Ivy trending.

What's all the fuss about? Well, in addition to releasing the album, Beyoncé also uploaded 30-second previews of 17 music videos to YouTube to accompany each song – including the super-sweet 'duet' with her adorable daughter in a video called 'Blue' dedicated, obviously, to Blue Ivy.