Credit: Instagram

Uh-oh, it looks like Shay Mitchell is about to go from sweet to sassy, as the Pretty Little Liars star snagged a guest spot on Fashion Police! Shay recently Instagrammed this pic of her looking positively stunning next to the legendary Joan Rivers.

We love Shay’s grungy and girly outfit! She rocked a super-long shirtdress with a cool graphic print and a slick leather vest. (Maybe she felt inspired by her PLL persona, Emily?) We wonder what Joan would say about her choice of clothing. It’s definitely a lot younger than Joan’s outfit, but no less glam.

“So nice hanging with @joan_rivers again on set yesterday for a special segment of #fashionpolice,” Shay wrote as a caption. We can’t wait to see the segment for ourselves and hear what Shay has to say about celebrity fashion.

We have a hard time imagining Shay saying anything bad about someone’s fashion choices, but we bet this Little Liar will find a way to be positive even when talking about the worst red carpet looks.

Will you be tuning in to see Shay on Fashion Police? What do you think about her teaming up with Joan Rivers for some fashion critique? Share below!

Pretty Little Liars Season 4 premieres on Tuesday, June 11, 2013 at 8 p.m. ET/PT on ABC Family.