Lamar Odom Denied entry at Club because Ex GF Khloe Kardashian and French MontanaParty Inside!

An E! camera crew was conveniently posted up outside the club to capture the rejection -- so obviously there was speculation that Lamar's rejection was a set-up for "Keeping Up with the Kardashians" -- but a rep for Penthouse tells TMZ, not so.

The rep says the decision to deny Lamar was the club's decision alone. We're told the nightclub wanted to avoid another bottle-throwing Chris Brown-Drake situation, so bouncers refused to let him in.

Sources close to the Kardashians tell us the same story -- Khloe didn't even know Lamar planned to show up.

You'll recall, Brown and Drake were involved in a massive brawl at W.i.P. nightclub in NYC back in 2012. The brawl resulted in a bunch of lawsuits ... and the club even lost its liquor license for a while. So it's no wonder Penthouse was playing it safe.