Our PicksThe Delevingne Sisters, Rihanna, Fergie, and More Best and Worst Dressed of the WeekIsabel Wilkinson07.12.13Our PicksThe Delevingne Sisters, Rihanna, Fergie, and More Best and Worst Dressed of the WeekRosie Huntington-Whiteley’s bandeau, Naomi Campbell’s Alaïa gown, and Ciara’s too-Kanye-for-comfort ensemble. See this week’s fashion highs and lows.Isabel Wilkinson07.12.13 4:30 PM ETGetty (3), APBest and Worst Dressed, July 12, 2013Rosie Huntington-Whiteley’s bandeau, Naomi Campbell’s Alaïa gown, and Ciara’s too-Kanye-for-comfort ensemble. See this week’s fashion highs and lows. Victor Boyko/GettyBest Dressed, Seeing Stripes: Miroslava DumaFor Dior’s Autumn 2013/Winter 2014 show in Moscow this week, the street-style star looked fetching in a black dress with colorful stripes from the designer’s Resort 2014 collection. Anthony Devlin/WPA Pool/GettyBest Dressed, a Little Bonkers: The Delevingne SistersThose wacky Delevingne sisters gussied up for a reception hosted by Charles, the Prince of Wales, in honor of saving the Asian elephant from extinction. Even better than their strange headpieces, Cara yukked it up with Camila in a series of great photos. Chris Pizzello/Invision/APBest Dressed, Hint of Skin: Olivia MunnMunn showed some skin in a nightie-inspired Thakoon frock and ear cuff at the premiere of Season 2 of The Newsroom on July 10. Caroline McCredie/WireImage/GettyBest Dressed, Bandeau to the Rescue: Rosie Huntington-WhiteleyThe 26-year-old model looked stunning in a simple white Calvin Klein bandeau and skirt at a dinner for ModelCo in Australia. Stephen Lovekin/GettyBest Dressed, Summer Nudes: Blake LivelyBlake Lively looked tanned and beachy in a Burberry dress and Lorraine Schwartz jewels at the Turbo premiere in New York on Tuesday. Ben A. Pruchnie/GettyBest Dressed, FTW: Naomi CampbellCampbell looked statuesque in a black tiered Alaïa dress at the Novak Djokovic Foundation gala in London earlier this week. Lionel Cironneau/APBest Dressed, Throw Your Hands in the Air: RihannaRihanna looked pretty badass in a pleated Balmain dress, Manolo Blahnik satin boots, and a Christian Dior necklace as she stormed the stage at the Monte Carlo Sporting Summer Festival in Monaco as part of her Diamonds World Tour. Fortunata/Splash NewsBest Dressed, Easy A: Tika SumpterThe actress looked prim and proper in a Pre-Fall 2013 Stella McCartney black and white structured A-line dress and Christian Louboutin heels. Felipe Ramales/PacificCoastNewsWorst Dressed, Run of Shame: Suki WaterhouseModel (and Bradley Cooper girlfriend) Suki Waterhouse looked like she forgot to set her alarm, running down the streets of Manhattan in an oversize button-down, cargo shorts, and sneakers. Shareif Ziyadat/GettyWorst Dressed, Yeezus Look-Alike: CiaraUnfortunately for Ciara, Kanye West is the only person who can pull off (and get away with) a wildly printed Givenchy top, a long black skirt, and crazy oversize kicks. The singer promoted her new namesake album, Ciara, at J&R Music World in New York on Tuesday in the over-the-top ensemble. Dave Kotinsky/GettyWorst Dressed, Wigging Out: Amanda BynesAmanda Bynes channels her inner Smurf as she arrives for her appearance at the Manhattan criminal court in a bright blue-green wig. Her court-appropriate attire consists of a loose black tank, sweatpants, and sneakers. AKM-GSIWorst Dressed, Piling It On: FergieFergie looked a bit disheveled, layering a printed kimono over a black T and leggings. The colorful combo with her bed-head-styled hair and a bright Birkin made for messy Malibu attire.