O'Bviously this never happened on our TV screens, but that's not to say it couldn't have happened on Earth Prime-Time. We just were not privy to the event.
Princess Diana, AKA Wonder Woman, is an immortal who only appeared on Earth Prime-Time (as far as the Trueniverse audience is concerned) during World War II and the mid-1970s. But she was around since the Age of Legend and is still going strong on Themicyrae, better known as Paradise Island.
So it's pozz'ble, just pozz'ble that she returned to the land of mortal men during the 1960s and hung out and hanged ten with Batman. In fact, I think she was part of the ill-fated and unseen Justice League of America of Earth Prime-Time which began in the late 1950s and featured as its core members Superman, Batman, and Wonder Woman.
By the time Wonder Woman came back to surf with the Caped Crusader, the Man of Steel had been dead for a few years. (This according to the Toobworld timeline only.)