Move along, sideboob. There's a new cleavage trend in town — the boob window — and Pretty Little Liars star Ashley Benson is all about it.
 
Ash and her co-stars Vanessa Hudgens, Selena Gomez, and Rachel Korine struck a few sultry poses on the red carpet at the French premiere of their gritty new movie, Spring Breakers.

The PLL starlet — who's totally channeling Katy Perry's sexy look from the 2013 Grammy's — rocked a black gown with a diamond-shaped cut-out around the chest. Hey, if she's in a tiny bikini throughout the majority of her new flick, then what's a little boob window action on the red carpet?

Spring Breakers, which opens March 22, follows four college friends (Ashley, Rachel, Vanessa, and Selena) who decide to rob a fast food restaurant to pay for their wild spring break vacation. After being arrested for drugs at a party, the girls are bailed out by druglord Alien (played by James Franco), but their freedom comes at a price: the girls must do his dirty work.

Catch the next episode of Pretty Little Liars on Tuesday, February 19, 2013 at 8 p.m. ET/PT on ABC Family.