Lady Gaga is in the middle of an epic feud with Sharon and Kelly Osbourne after penning an open letter to 'Fashion Police' co-host Kelly, who said that little monsters are evil because they call her fat. Gaga defended her fans and responded, saying that Osbourne's role on a show where she insults people for their fashion choices is no different. Mama Bear Sharon penned her own open letter, calling Mother Monster a hypocrite. Now, Kelly's 'Fashion Police' cohort Joan Rivers is weighing in on the drama.

Rivers, 79, told ET (quotes via Us Weekly), "'Fashion Police is a comedy show; anyone that comes out of an egg should figure that out," referencing Gaga's stunt where she was carried on the 2011 Grammys red carpet in a giant egg.

Rivers also said Gaga should "lighten up" and worry about more important issues.

Um, Joan, the whole point of Gaga's open letter to Kelly was to point out that bullying takes many forms, including celebrity TV shows.

As for Gaga not using her celebrity to address more critical societal problems, um, hello? Have you not heard about the Born Brave Bus? Gaga and her Born This Way Foundation are stationing mobile mental health vehicles in the parking lot of her tour, offering help and support to monsters in need, tailgating style.

How's that not helping more critical issues?

Sounds like some 'Fashion Police' folks need to do their homework.

We got your back, Mama Monster!

Watch the Lady Gaga 'Born This Way' Video

More From PopCrush