I always get these two confused - but I'm pretty sure it was Audrey Hepburn and Gregory Peck (always want to say it's Katherine Hepburn, but she was the Spencer Tracey chick). Regardless, had to run back to the statue with the biting hand to do the tourist thing.
It turns out that it was really close to the Circus Maximus, but we forgot to do it the first time. We also didn't bother to stand in line and put our hand in the mouth - that was just a little too touristy.