Ariana Grande shows her support for Greta Thunberg following brutal statement at Trump

Ariana Grande has subtly thrown her support behind Greta Thunberg after the Swedish activist issued a savage statement against Donald Trump.

Greta, 22, who was on the Gaza-bound aid flotilla that was recently deported from Israel, took to Instagram yesterday (7 October) to share a lengthy message for the US president, 79.

She sarcastically penned: "I heard Donald Trump once again has expressed his very flattering opinions on my character, and I appreciate his concerns for my mental health.

"To Trump: I would kindly receive any recommendations you might have to deal with these co-called 'anger management problems' since - judging by your impressive track record - you seem to be suffering from them too."

And hidden within the 1.5million likes on the social media post, was one from none other than the Wicked star herself.

A pop culture Reddit page also picked up on the supportive move, pointing out that Ariana recently followed Greta and went on to her like her post.

Ariana Grande has publicly shown her support for Greta Thunberg (Milos Bicanski/Getty Images)

Greta's message comes after Trump commented on Greta's recent deportation from Israel, calling her 'a troublemaker'.

He told reporters: "You mean she’s no longer into the environment and now she’s doing this? She’s a troublemaker, she has anger management problems, and she should see a doctor.”

“She’s so angry, she’s so crazy, you can have her."

The Swedish activist made headlines this week after she and other pro-Palestinian campaigners were deported from Israel to Greece after Israeli forces intercepted the flotilla they were traveling aboard.

Upon landing in Athens on Monday afternoon, Greta told the press: "That this mission has to exist, it’s a shame! It is a shame! I could talk for a very, very long time about our mistreatment and abuses in our imprisonment, trust me, but that is not the story."

She added: "This action was challenging our extremely violent business as usual. We cannot take our eyes away from Gaza.”

Several activists who were freed in the last two days have given testimonies alleging mistreatment by Israeli authorities.

“There was some dehumanising and violence and shouting,” Roos Ykema, a Dutch member of the flotilla who was deported to Madrid on Sunday, told the Associated Press, adding: “But we got the European treatment."

Fans of the singer and actress have praised her for the move (Noam Galai/Getty Images)

Her comments were echoed by former Barcelona mayor Ada Colau, who returned to the Spanish city late Sunday.

“We were detained in a maximum security prison where there was no rule of law, they didn’t respect any of our rights,” Colau told journalists upon landing, "But we know this is nothing compared to what the Palestinian people are suffering every day in Gaza.”

Israeli authorities have rejected once the mistreatment accusations that have emerged in interviews with activists who were deported to Turkey, Spain and Italy over the weekend.

The interception of the flotilla led to large-scale demonstrations in cities across the world and large gatherings at airports to welcome deportees.

Reacting to the news of Ariana publicly supporting Greta, one Twitter user penned: "It's super important that Ariana is gonna support her, all support is valid and necessary at this time because even the president is harassing Greta."

Others chimed in with: "When you make the right people famous" and "Need her to be openly vocal more often."