A Summer outfit is not complete without the perfect pair of sunglasses, and our latest shady crush hails from Westward Leaning . After spotting these retro-meets-modern shades on trendsetters like Jessica Alba , Olivia Palermo, and Reese Witherspoon , just to name a few, it's clear they're the hottest ticket in Hollywood. And the best part? Every pair comes with a feel-good message. Each silhouette was inspired by a different social movement — like the Teach For America, John Glenn  Center For Science Education, and National Parks Conservation Association — and with every sale, $10 is given back to the cause. Pretty cool, right? Cruise through to see if your favorite fashionista has sported a pair of these killer specs — then shop their exact pairs.
— Additional reporting by Chi Chau
Reese blossomed in a floral-print blouse, magenta Proenza Schouler  satchel, two-tone d'Orsay pumps by 3.1 Phillip Lim, and the Louisiana Purchase Westward Leanings  ($180) in LA.
These Wintermute shades  ($210) rounded out Palermo's Paris Fashion Week look.
The street-chic star  finished her LA look with a leopard A.L.C bag, Charlotte Olympia  x Tom Binns  flats, and these Color Revolution shades  ($180).
Make a major statement in these mirrored Westward Leaning shades  ($180), almost identical to Perry's.
While vacationing in St. Barts, Alessandra Ambrosio showed off her fit figure in a rainbow bikini and this Sleeping Beauty  ($210) style from Westward Leaning .
Klum stuck with a black-and-white theme donning the popular Teddy Roosevelt  ($250) style of Westward Leaning  sunglasses while catching a flight.
Top your strolling style with Palermo's Children of California specs  ($180), in tortoise.
Selena suited up in a fringed Forever 21  poncho and these Love Thy Neighbor shades  ($250).
Lawrence chose these Sleeping Beauty Westward Leanings  ($210) in black to top her striped maxi and boxy tee.
The brunette stunner was all smiles romping around Malibu, CA, in a cropped Wildfox tank, white denim shorts, and these exact Westward Leaning sunglasses  ($250).
The model showcased her love for Westward Leaning  with an all-black ensemble and this Mercury Seven  ($180) style in Beverly Hills, CA.
Bell paired her floral maxi and cropped denim topper with these Westward Leaning sunglasses  ($195) and a blush leather crossbody in North Hollywood.
Score Jessica's exact beaded specs  ($250) or up the ante with this marbled version  ($250) by the celeb-approved brand.
At Milan Fashion Week, Palermo stepped out in leather pants, a brocade coat with a fur collar finish, and the black "Children of California" style.
Kate Bosworth  paired her Westward Leaning specs  ($180) with a Mulberry t-shirt, denim shorts, and JewelMint baubles for a stroll around LA with her main man, Michael Polish.
Theron left an LA dance studio donning an aztec-print tee, red slip-ons, and these Wintermute Westward Leanings  ($180).
Reese arrived at LAX working a pink printed scarf, coordinating flats, and these Louisiana Purchase  ($180) specs.
Nicky strolled NYC in an all-gray ensemble and black accessories — leather Proenza Schouler  satchel, Isabel Marant  sneakers, and cool-girl Westward Leanings  ($180).
Ambrosio accessorized her Coachella style with riding boots, a fringed crossbody bag, and these Louisiana Purchase  ($180) Westward Leaning  sunglasses.
Panettiere accessorized her cool-weather look with a pair of red-hot mirrored shades similar to these Color Revolution specs  ($180).
Jessica topped her monochomatic look with a pair of Westward Leaning  Love Thy Neighbor shades  ($250) in Paris.
A fur trapper and these Wintermute N°10.1 sunglasses  ($210) completed Hudson's Sundance style perfectly.
Emily was spotted sporting her Westward Leaning sunglasses  ($195) with a printed dress and leather jacket while out and about in Sydney, Australia.
Ambrosio styled printed denim with a leather topper and Westward Leanings in LA's Brentwood neighborhood.