More than 100 artists across music, film, theatre, and literature have signed a statement of support for Lorde's decision not to perform in Israel.
The letter, published in The Guardian on Saturday, was signed by a range of artists including writer and activist Angela Davis, actors Mark Ruffalo and John Cusack, and musician Kathleen Hanna.
"We write in support of Lorde, who made public her decision not to perform in Israel and has now been branded a 'bigot' in a full page advertisement in the Washington Post," the letter read.
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"Shmuley Boteach, the author and promoter of the advert, supports Israel's illegal settlements and wrote last month on Breitbart to thank Donald Trump for 'electrifying the world' with his recognition of Jerusalem as Israel's capital in defiance of international law.
"He has nothing to teach artists about human rights.
"We deplore the bullying tactics being used to defend injustice against Palestinians and to suppress an artist's freedom of conscience.
"We support Lorde's right to take a stand."
Lorde cancelled the Tel Aviv gig, scheduled for June, on Christmas Day.
"I've received an overwhelming number of messages and letters and have had a lot of discussions with people holding many views, and I think the right decision at this time is to cancel the show," she said at the time.
"I'm not too proud to admit I didn't make the right call on this one. I'm truly sorry to reverse my commitment to come play for you."