Batgirl
@TheProgrammerGuy Heh. So this has been the conversation in all the places I've encountered this image. Some claim it's been 'shooped out. In actuality she just has a very flat stomach and an exceptionally small navel. Another shot from the same series https://imgur.com/rV9V2MZ.
nananananana na na ... na ...... naaaaa .. I'd!
I'd let her thwart me anytime.
THWOK!
@TheProgrammerGuy Fact: before the mid-70s, *nobody* had belly buttons; not Barbara Eden, not Lee Meriwether, and definitely not Yvonne Craig (q.v. "The Cage/The Menagerie"). It wasn't until Mariette Hartley's "Genesis II" breakthrough (with two!) that navels came into existence.