Kim Kardashian West and Kanye West. Picture: Bang Showbiz

Kim Kardashian West says her heart is "so happy" after Kanye West donated R14.6 million to charity for her 39th birthday.

The 'Keeping Up With The Kardashians' star was overjoyed when her husband made the huge donation to prison reform charities to mark her 39th birthday on Monday.

She wrote on Instagram: "I got amazing gifts from my whole family and Kanye for me the most amazing bags. But he also donated $1 million(R14.6 million) to my favourite charities that work so hard on prison reform on my behalf from him and the kids. This makes my heart so happy!"

Kim also shared a photo of the certificate, which listed the charities benefitting as Cut 50, Buried Alive Project, Equal Justice Initiative and Anti-recidivism Coalition. The certificate read: "Certificate of donation in honour of Kim Kardashian West. A Donation of $1 million(R14.6 million)  has been made in your name by Kanye, North, Saint, Chi and Psalm West to the following."

Kim is currently studying law and she has insisted she is very "serious" about it, as she wants to help prison reform.

She previously wrote in a lengthy Instagram post: "Last year I registered with the California State Bar to study law. For the next 4 years, a minimum of 18 hours a week is required, I will take written and multiple choice tests monthly. As my first year is almost coming to an end I am preparing for the baby bar, a mini version of the bar, which is required when studying law this way. I've seen some comments from people who are saying it's my privilege or my money that got me here, but that's not the case.

"One person actually said I should 'stay in my lane'. I want people to understand that there is nothing that should limit your pursuit of your dreams, and the accomplishment of new goals. You can create your own lanes, just as I am. The state bar doesn't care who you are. This option is available to anyone who's state allows it. It's true I did not finish college. You need 60 college credits (I had 75) to take part in 'reading the law', which is an in office law school being apprenticed by lawyers. For anyone assuming this is the easy way out, it's not."