The claws are still out on the set of Good Morning America! Although feuding co-hosts Amy Robach and Lara Spencer recently pretended to make nice during a public lunch date, Breaking Celebrity News has learned that behind the scenes, the cat-fighting continues. And now, only Breaking Celebrity News can reveal the reason: Robach thinks Spencer is a huge flirt!

An insider reveals, "Among the gripes Amy has with Lara is that she shamelessly flirts with the male staff and guests. It's cringe-worthy, according to Amy, and she hates to see it."

"With Michael Strahan about to join the show, Amy is preparing for even more of an ick factor," the source continues. "Lara is a married woman, and it's just unprofessional in Amy's opinion."

In addition, as Breaking Celebrity News has reported, sources say Robach resents Spencer for blowing Robach off during her cancer battle.

When Robach underwent a grueling double mastectomy earlier this year, “Lara never came to visit Amy in the hospital, or even called her to see how she was doing," the source claims. "Robin Roberts, a breast cancer survivor, helped Amy navigate the complicated maze of what doctors to see, and has been a true friend to her during this time."

After Breaking Celebrity News reported on the pair'