How Kanye kept his proposal plans a secret

@RealJoeFrancis via Twitter

Twitter photo posted by Joe Francis of Kim Kardashian and Kanye West at their engagement event in San Franciso on Monday. It was captioned 'Congratulations @KimKardashian and @kanyewest ! It was amazing to share such a special moment with you both'

Kanye West planned his surprise marriage proposal like it was a spy-op, complete with cover stories and fake Instagramming - and Kim Kardashian was even blindfolded for maximum drama, attendee Joe Francis told the Daily News.

'It was absolutely like a military operation. The ruse was so great, a real class act,' the 'Girls Gone Wild' founder said Tuesday.

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'She was so shocked and so happy ... everybody got choked up.'

Francis and Kardashian have been friends for years, and he said all the guests were contacted three or four days in advance and sold the story that they were flying up to San Francisco for her surprise 33rd birthday party.

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Francis said Kim's sisters, Khloe and Kourtney, went the extra mile to cover their tracks.

'I think Kim thought her sisters were abandoning her on her birthday. They said they were at a spa in Arizona, and they were fake Instagraming,' he said.

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'Kim really believed everyone was where they said they were. Her face was just absolute shock when we all came out running.'

According to Francis, about 50 guests hid in two dugouts as Kim and Kanye drove onto the field at AT&T Park.

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'They pulled up in a car right in the middle of the field, around second base,' he said. 'She was blindfolded, and there was crowd noise over the speakers, so when she got out of the car, it probably sounded like it was packed with people. The sound came from all around, it was really cool.'

He said Kim looked 'stunning.'

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'She was so beautiful, and people gasped when he got down on one knee. We were about 200 yards away, so we were watching this play out like a long shot in a movie,' he said.

'It was so dramatic with the orchestra and the fireworks.'

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He said that when everyone ran out to join the couple, he made a beeline for his friend.

'The first question I asked her was, 'Did you say yes?' Then I asked Kanye, 'Did she say yes?' There was this big question on the billboard and we needed an answer. She just looked at me and said 'YES!'' he recalled.

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'It was just adorable, one of the most romantic things I've ever witnessed.'

Other guests included YouTube founder Chad Hurley and Zynga founder Mark Pincus, he said.

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'I believe Kanye is a genius, I do,' Francis said. 'He got all these high-profile people to San Francisco, to hotels, and moved them all around without anyone tweeting sightings. We were all sworn to radio silence.'

ndillon@nydailynews.com