To the left, to the left -- the most famous baby on the planet is off to the left.

Blue Ivy Carter made her second ever onstage appearance this week, joining hot mama Beyonce for a performance of 'Irreplaceable.' And yes, it was as glorious as you'd think.

Queen Bey delivered a rollicking performance of her sassy breakup anthem at the O2 Arena in London, rocking a sparkly indigo jumpsuit and singing her heart out. Towards the conclusion of the song (around the 5:45 mark), Princess Blue appeared, sporting an adorable dress and headphones to protect her ears. She strolled over, taking her proud mom's hand, then ducked backstage once more.

(This means Blue Ivy is walking. How old do you feel?)

And for those of you saying this is Blue Ivy's first time onstage? You must have forgotten that baby girl's been up there before -- while she was in utero.