Nikki Bella is apologizing after some mean comments she made about Chyna back in the day resurfaced on social media ... she says it wasn't worth the cheap laugh.
Here's the deal ... Nikki and Brie Bella were on "Fashion Police" back in 2013 and the resurfaced clip shows Nikki holding up a photo of Chyna and saying, "We don't know if it's a man or a woman."
Nikki apologized Monday after getting dragged online, saying .