Mexico City : Actor Robert Downey Jr reportedly went skinny dipping at a hotel here.

According to a source, the "Iron Man" actor flashed his manhood while swimming naked in an empty guest pool at St. Regis Hotel in Punta Mita, reports aceshowbiz.com.

"(Robert) gave giggling female guests a full-monty glimpse of his rod, er, bod when he padded stark naked out of his swanky St. Regis suite in Punta Mita, Mexico, for a late night skinny-dip, dirty-diving into its huge, empty guest pool," a source told National Enquirer newspaper.

"When a sharp eyed female vacationer spotted Downey splash down stark naked, word spread around the resort quicker than Montezuma's revenge, and suddenly, naughty rich ladies were dashing out on their balconies, panting and hungry for sneak peeks at the stripped-down star. 

"There's no question: All agreed 'Iron Man' looked great... and he packs one big burrito," the source added.-Agency