WORST: Some trends just shouldn’t be mixed! Alicia Keys oddly paired a prep school blazer with disco ball pants, while performing onstage in Illinois.

BEST: Beyonce looked gorgeous at hubby Jay-Z’s after party at the 40/40 club in New York, pairing an embellished tank with skintight satin leggings, and finishing off the look with towering stilettos.

WORST: Did Lindsay realize her leggings were a tad too sheer? The jet-setting beauty, hit the Nokia X6 Party in London wearing a modern cutout tank with high-waisted leggings, and topping it all off with a fedora.

BEST: Mischa Barton looked blonde and beautiful in Milan, matching red heels to her flowered mini, and wearing a totally chic, crystal headband.

BEST: Abigail Breslin looked dreamy in an off-the-shoulder, white Marchesa mini, at the opening night curtain call of The Miracle Worker.

WORST: Jennifer Morrison looked like a beauty pageant contestant, wearing a one-shouldered number, which featured a chiffon drape similar to a sash.

WORST: Whitney Port was wearing her grandmother’s lime green pants and heels from the 1970’s with a tiered jacket in New York City.

BEST: Sofia Vergara flaunted her to-die-for curves in an eggplant mini, adding muted grey peep-toed platforms.

BEST: Kelly Rowland looked fierce and fab in Sydney, attending a Mardi Gras VIP party in blue and black leopard print mini, peep-toe boots and fingerless gloves.

WORST: Kelly Osbourne’s old-fashioned boots and wide-brimmed hat were an awkward addition to her casually chic threads.

BEST: Gillian Jacobs looked smashing in a flutter-sleeved, blue dress at Paleyfest 2010 in Los Angeles.

WORST: Elisha Cuthbert hit the streets in Los Angeles, wearing too many trends that refused to mesh together.

BEST: Michelle Rodriguez toned down edgy threads by adding refined, but simple sandals.

WORST: Nicollette Sheridan hit Mr Chow in Los Angeles, harshly pairing thigh-high boots with a bubble-gum pink skirt suit.

BEST: Diddy did Fashion Week in Paris, wearing an oversized medallion with luxe black threads.

WORST: Cassie attended the Gareth Pugh Fashion Show in Paris with Diddy, wearing gold-tipped, granny boots with a belted, pony hair coat.

BEST: Miranda Kerr looked Fashion Week fab in Paris, tactfully matching her boots to her sunglasses.

BEST: Sharon Osbourne jazzed up her swinging trench with a long, color-blocked scarf, while out and about in London.

WORST: Amanda LePore hit Mardi Gras in Sydney, showing off a little too much of everything, in a stripper-like, purple dress.