Fashion See How Jessica Alba, Reese Witherspoon, and More Wear Summer's Must-Have Wardrobe Staple By Andrea Cheng Andrea Cheng Andrea Cheng is a New York-based writer and editor who covers all things fashion, celebrity style, beauty, and trends. She was previously the Digital Fashion News Editor at InStyle. InStyle's editorial guidelines Updated on July 1, 2013 @ 02:00PM Pin Share Tweet Email Trending Videos Photo: NIVIERE/SIPA When it comes to effortless summer dressing, sundresses are the unproclaimed uniform of the season, not to mention a favorite way for A-listers like Nicole Richie (in Thakoon), Reese Witherspoon (in Kate Spade), Kiernan Shipka, and Jessica Alba (in Tory Burch) to stay cool and chic in rising temps. That's why we rounded up the best celebrity sundresses for warm-weather outfit inspiration! From demure ruffles to bold citrus prints, this staple comes in all shapes and colors under the sun. Click the photo to take a closer look at each dress. [wrn_button url="https://www.instyle.com/fashion/summer-dress-inspiration-pick-your-favorite#324250" text="SEE THE PHOTOS!" title="SEE THE PHOTOS!"] 01 of 22 Taylor Swift Milton Ventura/Broadimage Taylor Swift in Anthropologie 02 of 22 Solange Knowles Premiere/Rocstar/CPR/FameFlynet Solange Knowles in Alice + Olivia 03 of 22 Rosie Huntington-Whiteley Rex Features/startraksphoto.com Rosie Huntington-Whiteley in a floral maxidress Love this dress? Put it in your A-List and share on Facebook! 04 of 22 Reese Witherspoon Pablo/Stoianov/FameFlynet Reese Witherspoon in Kate Spade 05 of 22 Nicole Richie Norman Scott/startraksphoto.com Nicole Richie in Thakoon 06 of 22 Pippa Middleton XPOSUREPHOTOS.COM Pippa Middleton in Project D Love this dress? Put it in your A-List and share on Facebook! 07 of 22 Gwyneth Paltrow Amanda Schwab/startraksphoto.com Gwyneth Paltrow in a printed minidress 08 of 22 Padma Lakshmi Josiah Kamau/BuzzFoto.com Padma Lakshmi in Alexander Wang 09 of 22 Kiernan Shipka Bill Davila/startraksphoto.com Kiernan Shipka in a sweet sundress Love this dress? Put it in your A-List and share on Facebook! 10 of 22 Olivia Palermo Marcio Honorato/startraksphoto.com Olivia Palermo in a tiered LWD 11 of 22 Lauren Conrad GG/FameFlynet Lauren Conrad in Yoana Baraschi 12 of 22 Kirsten Dunst David Krieger/bauergriffinonline Kirsten Dunst in Louis Vuitton Love this dress? Put it in your A-List and share on Facebook! 13 of 22 Kate Middleton Chris Jackson/Getty Images Kate Middleton in an eyelet sundress 14 of 22 Jessica Alba Jen Lowery/Splash News Jessica Alba in Tory Burch 15 of 22 Miranda Kerr Curtis Means/ACE/INFphoto.com Miranda Kerr in a floral sundress Love this dress? Put it in your A-List and share on Facebook! 16 of 22 January Jones Stefanie Keenan/Getty Images for Coach January Jones in a floral sundress 17 of 22 Leelee Sobieski FilmMagic Leelee Sobieski in a yellow cocktail dress 18 of 22 Elizabeth Banks Stefanie Keenan/WireImage Elizabeth Banks in Tucker Love this dress? Put it in your A-List and share on Facebook! 19 of 22 Dianna Agron CHP/FameFlynet Dianna Agron in a seersucker sundress 20 of 22 Kate Mara Donato Sardella/WireImage Kate Mara in Joe Fresh 21 of 22 Michelle Williams Guillermo Bosch/INFphoto.com Michelle Williams in a floral shift Love this dress? Put it in your A-List and share on Facebook! 22 of 22 Diane Kruger NIVIERE/SIPA Diane Kruger in Marios Schwab