Britney lance accident ✔wardrobe fail}
Britney spear ✔slipping her ✔sensational curves}
Britney spear ❣unintentionally revealing a bit too much}
Britney arrow exposed ❣inadvertently}
Britney arrow ✔with a wardrobe malfunction}
Britney spear caught in an embarrassing slip-up}
Britney spear accidentally ❣flashing on stage
Britney spear with a accident of elegance
These are just a few examples. Feel free to mix and match the synonyms to create more unique content.