In her first statement since the romantic proposal, bride-to-be Kim said that she is "the luckiest girl in the world."
"Last night was truly magical!!! I am the luckiest girl in the world!' the reality star told E! "I get to marry my best friend!"
On Tuesday, Kim took to Twitter to share her answer. "YES!!!" she wrote, alongside a snap of her huge diamond engagement ring.
Kanye asked his girlfriend and mother of their baby daughter North West to marry him in a grand gesture proposal on Monday night in front of the reality star's family and friends on her 33rd birthday.
According to E! News, Kanye, 36, hired out the AT&T Park stadium in San Francisco for the special occasion.
Kanye, who had cancelled the second concert of his world tour which was to take place on the same day, popped the question to Kim after serenading her with a 50-piece orchestra.
The orchestra played Lana Del Rey's song Young and Beautiful followed by Kanye's own love song to Kim Knock You Down.
The romantic gesture was accompanied by a dazzling fireworks display. The famously close-knit Kardashian family and friends then witnessed the moment that Kanye, 36, presented the mother of his child with a 15-carat diamond ring by celebrity jeweller Lorraine Schwartz.
"Kanye was involved in every single way," says a rep for Lorraine Schwartz. "He had a vision from the beginning. He looked at a lot of stones and he wanted only the best.
"He and Lorraine emailed back and forth, and stayed up nights discussing how he wanted it to be. He wanted the diamond to look like it was floating on air. Everything was his idea from beginning to end."
This will be the third marriage for 33-year-old Kim. In 2000, the reality star, then 19, married music producer Damon Thomas but the couple split four years later.
Then in August 2011, she wed basketball star Kris Humphries; their marriage famously lasted just 72 days.