Last week, US President Donald Trump's ex-wife Ivana made headlines when she called herself "first lady" in an interview ahead of the launch of her memoir. The real first lady, Melania Trump, didn't take this lying down, putting out a sharply worded statement calling the former's comments "attention-seeking and self-serving noise."

This incident begs the question: what do you do when you have your partner's tricky ex to deal with? Alternatively, what if you're the ex who has been wronged?