Alex Rodriguez has reportedly been caught with his pants down.

The New York Post is reporting that New York Yankees superstar stepped up to the plate with a mysterious, busty blonde in Toronto over the holiday weekend.

The pair dined with two pals at a pricey steakhouse late Sunday night, then headed to a glitzy strip club before making their way to his hotel, where the pair ducked into an elevator and headed upstairs just after midnight.

Neither were seen again for the rest of the night.

A spywitness saw A-Rod and the Blonde go into the Brass Rail just after 11 p.m.

Home to what one Web site calls, “Toronto’s most beautiful all-nude dancers,” the Brass Rail is known for its booming sound system, overflowing crowds, overpriced beers and $20 lap dances

Apparently wife Cynthia and the couple’s 2 1/2-year-old daughter, Natasha weren’t invited to A-Rod’s weekend party.

“No comment,” Alex said when The Post asked him about his north-of-the-border jaunt with the blonde.