Tim Gunn: Taylor Momsen is a Sad, Pathetic Brat!

Tim Gunn certainly does not mince words, and Tuesday night, the fashionable Project Runway fellow had some choice ones for Gossip Girl star Taylor Momsen.

While promoting his new book, Gunn's Golden Rules: Life's Little Lessons for Making It Work, Tim just shot a guest spot on the new season of Gossip Girl.

Let's just say he wasn't impressed with T-Moms.

For one, he says if the actress paid more attention to her lines than her phone, the Pretty Reckless frontwoman woman be much better at her day job.

He says he found Momsen "sad" and pathetic."

"What a diva!" he says of the trouble-causing 17-year-old lightning rod. "She was pathetic, she couldn't remember her lines, and she didn't even have that many. I thought to myself 'why are we all being held hostage by this brat?"

The main problem, he says, was her BlackBerry use.

If he were a regular on the show, "I'd say, 'You know young lady, there are hundreds of thousands of girls who are just as attractive and even smarter than you. Why are you acting like this show is a huge burden on you?'" Gunn says.

To think, he didn't even call out her high-class hooker look.

"[Taylor] was on her phone during every single break. I wanted to tell her, 'If you weren't on your BlackBerry, you can actually retain this stuff.'''

Gunn says he's not trying to slander her, but "I'd just ask her 'do you want to share with me why you're always on your phone?' At one point the director leaned in and whispered to me, 'this is day in, day out, my life.' She annoyed the entire crew."

Tim also admitted that he's a total reality-TV junkie and weighs in on the The Real Housewives of D.C.'s most-hated couple, Tareq and Michaele Salahi.

"The Salahis are sociopaths! They believe their own lies," said Gunn.

Lastly: "It's like we've gone back to ancient Rome," he says of the infamous fight between Danielle Staub and Teresa Giudice during the RHONJ reunion.

"We've gone back to the Colosseum where we watch people rip each other limb to limb. I want a DNA test. How far are these women from wild animals?"

We're loving this guy right now.