Before you go, we thought you'd like these...  One of this biggest red carpet offenses is making yourself look older than you actually are -- especially in youth-obsessed Hollywood.  Jodie Sweetin was among these wrongdoers in a frumpy gray tie-dye muumuu and a very dated hairstyle. Actress Natalie Dormer's soft white suit with wide pantlegs and sleeves felt a little drab and more appropriate for an actress older than Dormer's 34 years.  It wasn't just the ladies this week, either. Ansel Elgort looked absolutely ridiculous in a bizarre outfit comprised of cropped camo pants, a green buttondown and way-too-small printed black blazer.  But while there were some definite misses, stars like Natalie Portman, Rita Ora and Chris Pine hit some high notes in killer styles. Click through the slideshow below for this week's best and worst dressed celebs.  Fab or Flop: Week of Aug. 14  Flop: We're not sure what Ansel Elgort was thinking when he stepped into this outrageously mismatched outfit. The green buttondown and camo pants were odd enough, but he pushed it over the edge with his size-too-small printed blazer.  Fab: Chris Pine looked totally dapper in black cropped slacks, chic loafers and a cool printed short-sleeved buttondown.  (Photo by Kim Jong Hyun/Anadolu Agency/Getty Images)  Flop: Jodie Sweetin totally missed the mark in a frumpy gray tie-dye muumuu and dated hairstyle.  Fab: Natalie Portman looked totally chic and pulled together in a white two-piece with subtle polka dot accents. Black lace pumps and soft waves completed her look.  Flop: Actress Natalie Dormer's soft white suit with wide pantlegs and sleeves felt a little drab and more appropriate for an actress older than Dormer's 34 years.  (Photo credit should read ANGELA WEISS/AFP/Getty Images)  Fab: Rita Ora knocked it out of the park in a stunning off-the-shoulder black and white top with blouson sleeves. Cropped black slacks and pointy white heels matched the cool top perfectly. Pulled-back hair and glam makeup complemented the sophisticated look.  (Photo by Robert Kamau/GC Images)  Flop: Justin Bieber's lady love, Sofia Richie, looked silly in this oversized black, green and yellow overcoat.  (Photo by Jun Sato/GC Images)  Fab: Lady Gaga turned heads in a see-through tee that left her bare bust exposed. Tucked into ash gray jeans and paired with an edgy studded belt and black booties, the look was a total win.  (Photo by Josiah Kamau/BuzzFoto via Getty Images)  Flop: Elle Fanning's corset tutu dress looked like it was designed by a 5-year-old. The chains, bows and patches were a bit over-the-top.  Fab: Model Shannan Click opted for a gunmetal spaghetti strap gown, loose waves and red lips.  Flop: Tove Lo's oversized bomber jacket looks frumpy over her super high-waisted acid wash denim skirt.  (Photo by John Lamparski/Getty Images)  Fab: Fergie was totally rockstar-chic in cool, zipper-adorned white skinnies, an oversized striped buttondown, necktie and "steel-toed" booties. A black tote back and sunnies completed her killer ensemble. (Similar shirt here.)  Flop: Singer Anne-Marie took a little too much inspiration from the '90s -- and Disney princess Jasmine -- in this off-the-shoulder bandeau and oversized purple pleated pants. Furry slides and statement earrings added to the messy look.  Fab: Karrueche Tran flashed her defined abs in high-waisted, wide-legged blue pants with a strappy black belt and black tube top.  (Photo by gotpap/Star Max/GC Images)  Flop: Ariel Winter turned heads in a totally '70s-inspired pinstripe suit by Alice + Olivia and a very low-cut black crop top -- but the pants didn't fit her correctly and the print was a bit too gaudy for our taste.  Fab: Sofia Black D'Elia did metallics right in a fun short-sleeved gown with a sexy thigh-high slit.  Flop: Actress Peyton List's dreary sheer skirt totally fell flat.  (Photo by Barry King/Getty Images)  Fab: Zoe Saldana wowed in a gorgeous gold long-sleeved midi dress with a turtleneck collar and cool, geometric print. Nude heels, drop earrings and an updo completed her chic look.  (Photo by VCG/VCG via Getty Images)  Flop: Heather McDonald looked ready for dinner on the cruise ship in white shorts and an underwhelming black crocheted top.  Fab: Now that's how you travel in style! Karlie Kloss wowed in a blue long-sleeved crop top with blouson sleeves and white high-waisted pants.  Flop: Natalie Portman's oversized white dress was totally drab.  (Photo by Michael Loccisano/Getty Images)  Fab: Ashley Love-Mills was breathtaking in a gorgeous white jumpsuit with a deep, plunging neckline. We love the contrast of her dark locks with the bright-white frock.  Flop: Skai Jackson's floral dress would have been absolutely adorable if not for the sheer cropped cape on top.  (Photo by David Crotty/Patrick McMullan via Getty Images)  Fab: Alex Morgan was totally summery chic in a bell-sleeved romper and nude wedges.  (Photo by Mike Marsland/Mike Marsland/WireImage)  Flop: We typically love Rita Ora's daring styles, but this printed frock totally added bulk to her petite frame. Her wild, teased locks didn't help.  (Photo by Robert Kamau/GC Images)  Fab: Model Shanina Shaik was a total bombshell babe in a sexy little red minidress with a halter neckline and keyhole cutout at the bust. Sultry waves and clear, sandals completed her kncokout look. (Similar dress here.)  (Photo by Josiah Kamau/BuzzFoto via Getty Images)  More from AOL.com: Fab or flop: Kelly Osbourne's floral dress, Diane Kruger's lace skirt and more Ariel Winter sizzles in sexy one-piece at pool party Style notes: Katy Perry shoe line, Victoria Beckham beauty both coming soon
Natalie Portman's adorable white set was a total win -- but many stars completely flopped on the red carpet this week.