Josh Duhamel has got some seriously sexy dance moves!

The "Safe Haven" star appeared on the "Late Night With Jimmy Fallon" show to promote his latest flick ... but somehow he ended up grinding on the talk show host!

You think Fergie showed him those moves?

The handsome actor played down his skills on the dance floor, telling Fallon that when he's out with his "Black Eyed Peas" lady, "I keep the expectations low."

Then he suggested dancing with Jimmy, "We could dance if you like," he said.

Check out the clip above so see Josh's booty pop and Fallon get low -- seriously, it's great!

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