Blue Ivy's Fairy Princess 4th Birthday

Blue Ivy's fairy princess-themed 4th birthday party looks like it ran up a tab worthy of a celebrity wedding ... but that's just how Jay Z and Beyonce roll.

Blue turned 4 in January, but Bey just uploaded the pics from inside the shindig. Looks like the celebration included some Hunger Games-styled bow and arrow practice, and teepees ... for those serious 4-year-old sit-downs.

Hired entertainment? None of mom and dad's singing or rapping pals -- TWO fairy princesses!