Michael Irvin -- Buys Nightclub Roses For Dude ... Here's Why.

It was like "The Bachelor" outside of the Hollywood nightclubs this weekend -- with Michael Irvin handing out roses in front of Bootsy Bellows.

So, who was the lucky recipient?

Ya gotta watch the clip ... Irvin explains exactly why he picked his target and it's pretty funny.

BTW, before Irvin got all flowery -- he explained why the Rams will be the hottest team in the league for top free agents this off-season.