It finally happened ... Ronda Rousey's MMA star husband is beating people up in WWE now, too!
Ex-UFC heavyweight Travis Browne was sitting ringside at "Raw" on Monday night where Ronda was battling Dana Brooke, who's dating NBA star Enes Kanter.
There have been rumblings for a while that Browne would get involved with WWE in some capacity -- and last night, it finally happened ... when he got out of his seat and threw a haymaker at a security guard who was trying to restrain Rousey.
Browne pulled Rousey into the crowd and personally escorted her into the tunnel -- it's the first time he's been featured as a relevant player in a WWE match.