Princess Kate’s little sis, Pippa Middleton, is becoming a bridezilla of royal proportions —

demanding hunky Prince Harry attend her nuptials solo — to keep his Hollywood girlfriend,

Meghan Markle, from stealing the spotlight on her 
big day!

Harry was told it was the Middleton family’s decision to only extend a “plus one” to married couples —

and no boyfriends or girlfriends are welcome, even for royals, snitched a palace insider.