Amber Heard is enjoying Barnaby Joyce's citizenship problems

Johnny Depp and Amber Heard back when they were husband and wife. Photo: Jason Merritt/Getty Images

Revenge is a dish best served on Twitter.

Just 18 months ago, actress Amber Heard was given a $1,000 one month good behaviour bond with no conviction after pleading guilty smuggling two Yorkshire terriers into Australia when her ex-husband, Johnny Depp, was filming the latest Pirates of the Caribbean movie on the Gold Coast.

The incident gained global notoriety when then agriculture minister Barnaby Joyce said the dogs, Pistol and Boo, had better “bugger off” back to the US or he would have them put down.

Heard and Depp subsequently made a public apology in a video message warning about the importance of Australia’s biosecurity laws, which Joyce posted to Facebook. It has been viewed more than 1.6 million times.

At the time, comedian Ricky Gervais said it “feels like a hostage video”.

Joyce said the legal action against the pair “reinforce the clear message I sent internationally last year that we will not tolerate disregard for our biosecurity laws, no matter who you are”.

Yesterday, the Nationals leader discovered he was also was in breach of Australian law, holding dual Australian-New Zealand citizenship, which section 44 of the Constitution forbids.

Joyce plans to challenge the issue in the High Court, but his predicament didn’t go unnoticed by Heard, who took to Twitter with her own observations.

“When Barnaby Joyce said ‘no one is above the law’ I didn’t realize he meant New Zealand law…” she wrote.

And then:

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