From the highly anticipated premiere of Burlesque and the latest Harry Potter installment, to the Vogue’s truly glam Fashion Fund Awards, stars were out and about on Monday wearing the best and worst fashions.

Sarah Jessica Parker enjoyed a night on the town with her family, getting all glammed up for the NYC premiere of Harry Potter And The Deathly Hallows: Part 1.  The Sex and the City actress appropriately opted for an all black look from Brit designer Vivienne Westwood, which she paired with cool cutout Nicholas Kirkwood heels.

Meanwhile, on the West Coast... Bobby Trendy was up to his usual Worst Dressed attire antics wearing beyond wacky duds.  From his crazy hat to his taffeta-embellished boots, the interior decorator looked even more bizarre than Johnny Weir(d) at the Harry Potter premiere.

Carey Mulligan and Blake Lively were dressed to thrill at the the 2010 CFDA/Vogue Fashion Fund Awards, both wearing impeccable designs from Chanel, while Leighton Meester opted for a less-than-flattering Prabal Gurung asymmetrical number.