Stars sizzled and fizzled in summer style during the first week of August, stepping out on the streets and hitting the red carpet in the Best and Worst of fashions.

Who cares about The Other Guys, when Eva Mendes is on the red carpet? The hard-bodied bombshell got clad in truly fem fashion, rocking a hot-off-the-runway Oscar de la Renta party dress from the Resort 2011 collection with Sergio Rossi heels to the NYC premiere of her movie. Mark Wahlberg and Will Ferrell may have been in their most dapper duds, but there is room for only one Best Dressed of the Week on our list.

Just when we though Bjork couldn't trump her infamous Academy Awards swan costume, we spotted the Icelandic singer at the Finnish premiere of Moomins and the Comet Chase dressed like Shrek! Wearing a boxy and pouf-shouldered green dress with colorful tights and edgy booties, she definitely was not dressed to impress.

PHOTOS: The Best, Worst And Wackiest Fashions Of Last Week

Gwyneth Paltrow and Jessica Alba were casually chic on the streets. Both leading ladies are embracing the latest trouser trend, jazzing up the surplus staples with luxe jewelry, shoes and handbags.

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Pam Anderson showed a lot more than support at Baywatch costar David Hasselhoff's Comedy Central Roast, wearing in undeniably sheer black gown, while Taylor Momsen was the anti-Material Girl, exposing her belly in a bra top at Madonna's NYC clothing launch.

PHOTOS: Eva Mendes' Stunning Style Spree

From Selma Blair's stunning Stella McCartney appearance at the Middle Men premiere, to Bobby Trendy's beauty blunder at the Prop 8 celebration party, see all the Best, Worst and Wackiest Fashions of the Week by checking out the gallery in Style.