In case you haven't heard, "fish gape" is now the pose du jour for selfies. The slightly toothy, open-mouthed look is the latest trend of many that have come and gone on newsfeeds over the years. Here, take a look at the most memorable.

The Smize

Joan Smalls, Tyra Banks, Rosie Huntington-Whiteley Instagram

What it is: Smiling with your eyes. You squint slightly, raise the eyebrows, and leave the mouth neutral.

When it started: "Smize" first entered the vernacular around 2009, when Tyra Banks introduced the term on cycle 13 of America's Next Top Model. While that was technically before social media really took off, the smize was a starting point for the average, non-model person to suddenly become aware of controlling the way her face looks in pictures.

The Duck Face

Kim Kardashian, Vanessa Hudgens, Ariana Grande Instagram

What it is: The classic pouted lips pose, also known as a "kissy face."

When it started: While you could argue that the dawn of Myspace profile pictures and digital cameras in the first half of the 2000s spawned the pose, it really picked up around 2012 just as Instagram started getting popular. Despite being the butt of many jokes, it still hasn't disappeared.

The Sparrow Face

Gigi Hadid, Rihanna, Khloe Kardashian Instagram

What it is: Something in between a smize and duck face–your lips pursed but slightly parted open.

When it started: 2013–it was a phenomenon in Japan's popular photo booths before making its way onto celebrity Instagram feeds. The social media-averse Olsen twins have been doing this for ages, though, intriguing everyone back in 2008 with their alleged trick for getting those signature pouts: saying "prune" before posing for a picture.

The Fish Gape

Zendaya, Chrissy Teigen, Selena Gomez Instagram

What it is: The sparrow face, but with teeth showing ever so slightly.

When it started: 2015. Celebs have been steadily joining the bandwagon, but who knows what selfie pose is on the come-up next? Something revolutionary? Regular smiling, perhaps?

Kristina Rodulfo Beauty Director Kristina Rodulfo is the Beauty Director of Women's Health—she oversees beauty coverage across print and digital and is an expert in product testing, identifying trends, and exploring the intersections of beauty, wellness, and culture.

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