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Tracee Ellis Ross @traceeellisross - This week is National Smile Week, and in honor of the holiday we’ve rounded up the cheesiest grins on the 'gram. By Jazmine A. Ortiz The Black-ish star looks super cute with her double buns, shades and sweet smile. (Photo: Tracee Ellis Ross via Instagram)

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Christina Milian @chrsitinamilian - "I love to laugh and smile way too much to not have super bright white pearly teeth! @cocowhiteuk cocowhite.com does the job!” Tina does what she can to keep her pearly whites their whitest and shares her secret via Instagram. (Photo: Christina Milan via Instagram)

Photo By Photo: Christina Milan via Instagram

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Draya Michele @sodraya - "Excited to start my @cocowhiteUK teeth whitening. I like that it's natural coconut oil instead of chemicals...My bottom teeth especially need it!!" The Mint Swim mogul is also a fan of oil pulling. (Photo: Draya Michele via Instagram)

Photo By Photo: Draya Michele via Instagram

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Nicki Minaj @nickiminaj - The rapper gives us her best thug grin while hanging out with her best friends. (Photo: Nicki Minaj via Instagram)

Photo By Photo: Nicki Minaj via Instagram

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Rihanna @badgalriri - A grin this big from the pop star can only mean one thing — she's at Crop Over in her native Barbados. She always has a ball and has the smile to prove it! (Photo: Rihanna via Instagram)

Photo By Photo: Rihanna via Instagram

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Ayesha Curry @ayeshacurry - "I love the quality time I get with Ryan during her feeding time. It's so special to me. I wish someone could give me milk to instantly fall asleep at any given hour during the day." Feeding time with the newest member of the Curry family makes the basketball wife smile from ear to ear. (Photo: Ayesha Curry via Instagram)

Photo By Photo: Ayesha Curry via Instagram/ Ayesha Curry via Instagram

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Gina Rodriguez @hereisgina - "I took a helicopter to set today, how can I not be smiling?" The Jane the Virgin star has been on cloud nine since her show became a breakout hit last season. (Photo: Gina Rodriguez via Instagram)

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Tinashe @tinashenow - "1 mil followers on IG! WOW!! Feels like just yesterday I would be so excited to hit 200 likes! #teamTinashe" Hitting one million followers on Instagram has the singer feeling herself enough to take several cheesy selfies. Her smile is contagious! (Photo: Tinashe via Instagram)

Photo By Photo: Tinashe via Instagram

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Hannah Bronfman @hannahbronfman - The entrepreneur is all smiles hanging out poolside with bae. (Photo: Hannah Bronfram via Instagram)

Photo By Photo: Hannah Bronfram via Instagram

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Ciara @ciara - Two smiles for one! "Love This Woman @AliciaKeys. She's Always Awesome," posts CiCi. (Photo: Ciara via Instagram)