During the show, former co-host Raven-Symoné asked, "Joy, are you black?" after seeing the photo.
Behar, now 76, explained that the picture was snapped at a Halloween party where she dressed up as a "beautiful African woman" and stressed that the hair was actually haira.
Ingraham and Behar sit on opposite sides of the political spectrum, but Ingraham tweeted her support Thursday despite of their differences over politics.
During the 2016 segment, Behar, an outspoken liberal, displayed a 1970s-era photo of herself at a Halloween party when she was 29.
"Is that you, Joy?" "In 1980, when I was a 19-year-old undergraduate in college, some friends suggested we attend a party dressed like rappers we listened to at the time, like Kurt's Blood, and perform a song".
"Joy ... are you my auntie, Joy?" On Friday, Northam apologized after a photo on his 1984 medical school yearbook page showed one man in blackface and another in a KKK robe. "That's my actual hair, though". The Democratic leader later said he was not in the photo and hadn't seen it before.
Virginia's governor and attorney general are being criticized for their use of blackface.
Representatives for Behar and ABC did not immediately respond to requests for comment. Florida Secretary of State Michael Ertel resigned last month after a photo surfaced showing him wearing blackface and dressing as a "Hurricane Katrina victim".
The audience and fellow co-hosts were demonstrably taken aback at how drastically different Behar looked, some of them giggling.