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Kris Jenner will celebrate her 70th birthday in grand style this weekend, and there's a buzz this may well be a surprise wedding!!!

Multiple sources with direct knowledge tell TMZ ... the bash will be held at the $165 million Beverly Hills estate of Jeff Bezos and Lauren Sanchez . Play video content

We're told around 300 people will attend. We're also told there will be a major recording artist performing during the party. Getty

Now here's what's interesting ... one of our sources mentioned this is a surprise wedding and almost no one outside a close circle knows about it. We cannot confirm, but there you go. We do know virtually most -- if not all -- the guests believe it's just a birthday party.

Interestingly, we're also told cameras for "The Kardash

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