The chinaman bowler stunned Aussie batsmen with his guile as he dismissed Matthew Wade, Ashton Agar and Pat Cummins on successive deliveries to join the likes of Chetan Sharma (1987) and Kapil Dev (1991) in a select club of Indians who have picked up a hat-trick in ODIs.
Jubilant with Kuldeep's achievement, his youngest sister Anushka Singh Yadav said that the entire family was feeling extremely proud of him.
"I am feeling really good that my brother has played so well. We all were waiting for this moment and it happened," Anushka told ANI.
"Though he did not start well, but we knew in our hearts that he will do something special today," she added.
His mother Usha Yadav, however, said she was very upset at the beginning because Kuldeep was not getting any wickets.
"It is such a proud moment for me as a mother. I got really upset when he was not getting any wickets," she said with teary eyes.
"I did not watch the match for sometimes and went to pray. And, he did what I prayed for him," she added.
Kuldeep's father Ram Singh said, "At first I was really upset, but it finally worked out well. Whenever he bowls he gets out results in first 2-3 overs but today he had to fight for it."
It was not the first time that Kuldeep v took a hat-trick for his country. He had become the first Indian to take a hat-trick in the U-19 World Cup, achieving the feat against Scotland in the 2014 edition.
"I am very delighted that Kuldeep has taken a hat-trick in such an important game. He rose to fame when he took a hat-trick in an under-19 game and now he has made to such level that he has taken hat-trick in a One-Day International against a side like Australia. I feel really proud that Kuldeep's friend," said Zeeshan Hamza, one of Kuldeep's friends. (ANI)