The 39-year-old actress, who is currently training for his first triathalon, runs the show Friday, added the source.
Nina Garcia would not confirm the news, but suggested the final "will be incredible."
"The guest star is one of the most emblematic of women around," she said recently us. "It will take the cake."
Look back at Jennifer Lopez's fashion highs and lows.
The judge Michael Kors has undoubtedly Lopez will make a great judge.
He tells the new issue of Elle, it could be a fashion editor.
"It is curious to know what is new and what is the next step," he says, "but at the same time, she knows perfectly to change his appearance and lifestyle."
Bravo A representative would neither confirm nor deny the role of Jennifer Lopez on the show.