Report CardKaty Perry, Selena Gomez & More Best & Worst Dressed (Photos)Misty White Sidell04.11.13Report CardKaty Perry, Selena Gomez & More Best & Worst Dressed (Photos)From Emmy Rossum and Julianne Hough to a surprising Lindsay Lohan, see the highs and lows in fashion’s week that was.Misty White Sidell04.11.13 10:46 PM ETGettyKaty Perry looked pretty in a firework dress, and Rita Ora channeled a pilgrim in black. See fashion’s highs and lows of the week. Stefanie Keenan/GettyBest Dressed in Fireworks: Katy PerryKaty Perry likes to ham it up in cartoonlike designs, which is what makes this (relatively) pared-down printed Thakoon dress stand out. The singer paired her outfit with simple hair and makeup, effectively knocking the refined look out of the park. Jon Kopaloff/GettyBest Dressed in an LBD: Selena GomezThis Marios Schwab dress was a nice departure for Spring Breakers star Selena Gomez, who typically veers toward busy ensembles. The tween dream stepped out in the English designer’s dress to Tuesday’s celebration for the London Showrooms in L.A. Dimitrios Kambouris/GettyBest Dressed in Stripes: Doutzen KroesVictoria’s Secret model Doutzen Kroes looked angelic in this knit ensemble by Michael Kors at Saturday’s dinner hosted by the designer and Halle Berry in honor of the U.N.’s World Food Program. Jamie McCarthy/GettyBest Dressed in Pink Lipstick: Emmy RossumShameless actress Emmy Rossum looked fantastic in a sparkling little black dress by Christian Dior, which she accessorized with oversized diamond jewelry and bright pink lips for Tuesday’s New Yorkers for Children Gala. Jeffrey R. Staab/CBSBest Dressed ‘Wait, She Actually Looks Good’: Lindsay LohanOn Tuesday, Lindsay Lohan made a tearful appearance on the Late Show With David Letterman to talk about her upcoming court-mandated trip to rehab. Despite the sorrows, Lohan wore a cheery floral-print dress by emerging New York label SUNO, looking the best we’ve seen her in years. Jason Merritt/GettyBest Dressed Pretty in Pink: Olga KurylenkoThe emerging Ukrainian actress attended Tuesday’s To The Wonder premiere in an elegant pink asymmetrical cocktail dress by Christian Dior. Jason Merritt/GettyWorst Dressed Hot Mess: RaeLynnCountry singer RaeLynn made the unfortunate choice of mixing her love for tutus with Texas in this look. She wore a ballerina-type dress and petite cowboy boots to Sunday’s Academy of Country Music Awards in Las Vegas. Andre Penner/APWorst Dressed, Sloppy Tuxedo: FergieFergie supported her beloved amFar charity at the foundation’s event in São Paulo on Friday. But her messy, poorly tailored tuxedo—which she paired with long teal talons and mussed-up hair—was a sloppy look. Frazer Harrison/GettyWorst Dressed Friends: Katie Armiger and Danielle PeckPosing together for a joint photo on the red carpet of Sunday’s Academy of Country Music Awards, singers Katie Arminger and Danielle Peck look like overwrought prom queens at their 15-year high school reunion. Arminger’s lame dress and Peck’s riff on Big Bird do not amount to greatness. Jon Kopaloff/GettyWorst Dressed Geometry Project: Julianne HoughJulianne Hough meant well when wearing a dress by up-and-coming English label Peter Pilotto. But the heavily printed design overwhelms her petite figure, making it look like the dress is wearing her instead. Bryan Bedder/GettyWorst Dressed Wicken: Rita OraOra showed up to ELLE’s Women in Music Celebration in a design fresh off of Saint Laurent Paris’s spring runway. But the ensemble didn’t translate into real life, leaving Ora to look like something of a Salem witch. Dimitrios Kambouris/GettyWorst Dressed Egg Shape: La La AnthonyWhile this Stella McCartney dress may have started off with good intentions, it was not the right shape (or fit) for former MTV VJ La La Anthony. To make matters worse, she paired the white frock with a bright pair of lime green pointy-heeled pumps.