Miley Cyrus isn't the only woman whose rear-end has been getting some extra attention from Robin Thicke in recent days.

The married dad was recently snapped in a friendly clinch with a hot blonde -- but the mirror behind them revealed Robin's X-rated intentions!

The reflection captured the Blurred Lines singer's hand creeping up the back of the woman's skirt as he groped her butt cheek with a grin on his face!

The photo is believed to ha