It's definitely not Nganou lol! He is the nicest guy and would not be at a party like that.
It's probably Jon Jones or Luke Rockhold as people have already suggested.
Both are returning this year, both have previously been champions. Jones (Light heavyweight) and Rockhold (Middleweight). It would be easy for Curren he clearly knows nothing about MMA to get mixed up and say they are heavyweight champions.
They are both loose guys. Jones is always in trouble regarding alcohol, drugs, domestic abuse etc and Rockhold is a bit unhinged in interviews etc. The RVCA link makes sense though.
Either way both of them are in their mid 30's and about 180 pounds heavier than Curren haha, crazy shit.