Amena Khan, from Leicester, said she "deeply regrets" the comments she made in 2014, and apologised for "upset and hurt that they have caused".
"We appreciate that Amena has since apologized for the content of these tweets and the offense they have caused", the rep said.
"I have chosen to delete them (tweets) as they do not represent the message of harmony that I stand for; I recently took part in a campaign, which excited me because it celebrated inclusivity", Khan wrote on Instagram. She said the tweets were detracting "from the positive and inclusive sentiment that (the campaign) set out to deliver".
"L'Oréal Paris is committed to tolerance and respect towards all people", a spokesperson to The Jerusalem Post.
Just days into her role, a British Muslim model has quit a major beauty brand's campaign after right-wing media outlets published her tweets from 2014, in which she criticised Israel's war in Gaza.
Model and blogger Amena Khan, from Leicester in England, was part of the new "inclusive" hair care campaign by the French beauty brand which made history last week by featuring a woman wearing a hijab.
A model has stepped down from a L'Oréal ad campaign after it was revealed that she had penned several harshly worded anti-Israel tweets in 2014.
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L'Oreal group, contacted by AFP, said it "approved" her decision. In other posts on social media that had not been deleted, Khan accused Israel of "Torture".
"Israel = Pharoah. Both are child murderers".
Khan who describes herself as being a "champion of diversity" wrote on her Instagram feed a week ago that she was "proud" to be included in L'Oreal's latest campaign. There is no little amount of irony involved in her cooperation with L'Oreal, which has operated a factory in Migdal Ha'emek for decades. " In another string of tweets that year, Khan stated, "Israel is a sinister state & the ones who suffer most are innocent children".
Gadot, the Israeli star of the hit Wonder Woman film, was recently announced as the new face of Revlon's "Live Boldly" campaign.
The backdated tweets, which have now been deleted, came to light after Amena was cherry picked by L'Oreal to appear in the promo alongside the likes of pop star Cheryl.
Revlon did not respond to multiple requests for comment.