Kardashian was even blindfolded for maximum drama.
Kim and Kanye romance in a fun photoshoot pre-baby bump.
The Girls Gone Wild founder said that the proposal was absolutely like a military operation, as the ruse was great real class act and the 33-year-old reality TV star was shocked and very happy.
The 40-year-old entrepreneur said that all the guests were contacted three or four days in advance and had sold the story that they were flying up to San Francisco to surprise Kardashian on her 33rd birthday.
He said that sisters Kourtney Kardashian and Khloe Kardashian said that they were at a spa in Arizona, and posted fake pics on Instragram.
Francis, who has been Kardashian's friends for years, said that the TV star really believed everyone's cover-up story and was absolutely shocked when they all came running onto the field at AT & T Park.
West, who pulled up in a car right in the middle of the field, and got down on one knee, with orchestra and fireworks in the background while the words 'pleeese marry meee!!! appeared on a giant scoreboard.
The 50 guests invited to the party hid in two dugouts, and ran out to join the couple after the proposal.
Francis added that the Black Skinhead hitmaker was a genius as he had managed to get all high-profile people to San Francisco, and moved them all around without anyone tweeting sightings.
The proposal ring: Is Kim K's 1 million pound engagement rock similar to Kris Humphries'?
Experts have revealed that Kim Kardashian's massive diamond ring is similar to the one she was given by her former husband Kris Humphries.
Tobias Kormind, co-founder of 77 Diamonds, who compared the new ring with TV star's previous Lorraine Schwartz diamond ring, said that it looks like a 16 carat Cushion cut, the Mirror reported.
Kormind said that West's ring is very similar looking to the Emerald cut, which Humphries had given to Kardashian.
The rap star must have been keen to get a different shape of ring and chose a Cushion cut, he said.
He added that the estimate value of the diamond of that size and quality would be in the region of a whopping 1 million pound.
Kim Kardashian flaunting engagement ring (Photo:Instagram/KimK)
So whats next, Kimye to wed in Vegas?
Kanye West and his fiancee Kim Kardashian have decided to tie the knot in Las Vegas, it has been revealed.
A source has revealed that West is a big Elvis fan and thinks it would be fun to get married in a chapel, the Daily Star reported.
The insider said that it was the rapper's suggestion and Kardashian had agreed that it was indeed a great idea.
The source said that the couple had earlier checked out the Graceland Wedding Chapel, the same place where Jon Bon Jovi and Miley Cyrus' parents got married and wants an Elvis impersonator sing Love Me Tender at their wedding.
The source added that the 33-year-old reality TV star and her fiance know that it's cheesy but feels that it is kind of sexy and cool at the same time.