Hey Giants, the Lombardi Trophy’s not quite yours yet.

The team’s official Web site jumped off sides yesterday, when it ran an ad that declared Big Blue the champions of today’s Super Bowl XLVI while hawking T-shirts celebrating their “title.”

The ad, which had pictures of Giants Eli Manning and Justin Tuck, was quickly removed.

An NFL spokesman said: “The hidden URL for the page was inadvertently available for a brief period of time.”