Grant Ellis may or may not have joined “The Bachelor” for the ‘wrong reasons’ — but who cares? Dude was destined to be a rap star after dropping bars on our “TMZ After Dark” tour … with a little extra fuel courtesy of Monster Energy!

Check it out — the hunky reality star lit up the party bus Saturday night … roses in one hand, Monster in the other … wooing the ladies with promises he had enough of both to go around.

Of course, the ladies were fighting for those roses … and Grant made a whole show of it — handing one to a lucky gal before they all hit the bars, knocked back shots, and took their turn on the mechanical bulls.

Grant was sweating it out so hard, he admitted the only thing keeping him alive was that Monster Energy — good thing too, ‘cause the guy was having the time of his life. Wanna keep up? Hit their site for more on the energy fuel.