Madonna has officially endorsed Hillary Clinton by blasting Donald Trump's sons via social media.

The pop superstar posted to her Instagram a photo showing Eric and Donald Trump Jr. with a dead leopard they are believed to have killed during a hunting expedition to Zimbabwe in 2012.

"'How Big of. P***y Do you have to BE to kill this Noble Animal for sport? Just ask Donald Trump Jr and his brother Eric. One more reason to vote for Hilary!" Madonna wrote.

Donald Jr. and Eric are also pictured with other wild creatures they had killed including an alligator, a water buffalo and an elephant.


Donald Trump has previously defended his children.

"My sons love to hunt. They are members of the NRA, very proudly. I am a big believer in the Second Amendment," he said.

"But my sons are hunters, Eric is a hunter and I would say he puts it on a par with golf, if not ahead of golf.......They're great marksman, great shots, they love it."

Clinton has secured the support of many celebrities and has enjoyed several high profile fundraisers.