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