Way to hold a grudge, Aunt Viv!

Janet Hubert, the actress who originated the role of Aunt Vivian on Will Smith's breakout sitcom The Fresh Prince of Bel-Air says he's not the Mr. Nice Guy that everyone thinks he is.

"He is still an egomaniac and has not grown up," she tells TMZ of Smith, who posted a photo of the former cast just before the holidays, hinting at a Fresh Prince reunion. "This constant reunion thing will never ever happen in my lifetime unless there is an apology, which he doesn't know the word."

So, why's she so mad?

Apparently, she blames Smith for her premature exit from the show after three seasons when she was replaced by Daphne Maxwell Reid. "There will never be a reunion ... as I will never do anything with a(n) (jerk) like Will Smith," Hubert says.