Just two months after her British beau Russell Brand emceed the VMAs, Katy Perry is serving as host of tomorrow’s European Music Awards. The sassy songstress appeared at a Berlin press conference in a frothy pastel chiffon-and-feather frock by Jenny Packham, making us ponder her sartorial choices for the big event. Perhaps she’ll wear this metallic number from Karl Lagerfeld’s spring 2010 collection, as she suggested to the designer at his Paris show last month.

New York’s Solomon R.Guggenheim Museum held its first annual Art Awards last night and style-savvy guests included Cynthia Rowley and Julianne Moore, among others—but we couldn’t get Kylie Minogue’s dress out of our heads. The Aussie songstress proved that neutrals can make a strong statement in an elegant beige number from Calvin Klein's spring 2010 collection.

The Avon Foundation for Women held its ninth annual gala at Cipriani 42nd Street, featuring presenters such as Courteney Cox, Patrick Dempsey, and Lauren Conrad. Reese Witherspoon, the evening’s co-host, took top fashion honors, in a strapless black-and-white silk and patent-leather Narciso Rodriguez number from the designer's spring 2010 collection.

Chloe, a thriller about marital infidelity, premiered at the BFI London Film Festival Thursday night, and star Julianne Moore stunned on the red carpet in a strapless crimson Bottega Veneta gown. Moore was one of the leading ladies featured in ELLE’s November Women in Hollywood issue.

Sienna Miller just made her Broadway debut in After Miss Julie, Patrick Marber’s adaptation of August Strindberg’s 19th-century play about class, seduction, and the battle of the sexes, which debuted last night at the Roundabout Theatre Company’s American Airlines Theatre. Miller chose a dramatic look for the premiere: a glittery, asymmetrical minidress from Balmain’s spring 2010 collection.

Amy Adams played Amelia Earhart in this summer’s Night at the Museum: Battle of the Smithsonian, and now Hilary Swank takes a turn as the pioneering aviator in Mira Nair’s Amelia. At the film’s New York premiere last night, Swank was flying high in a gorgeously draped petrol green gown from Vionnet’s resort 2010 collection.

Scarlett Johansson, the face of Mango’s fall/winter collection, celebrated the line’s launch in Munich, Germany yesterday. The Vicky Cristina Barcelona star stepped out in a sexy, versatile look by the brand that consisted of a tan pencil skirt, bow blouse, and peep-toe pumps. The actress, who recently celebrated her first anniversary with Ryan Reynolds and is set to star in Iron Man 2, continues to win praise for Break Up, the new album on which she collaborated with singer-songwriter Pete Yorn.

Terry Gilliam’s The Imaginarium of Doctor Parnassus, which stars Christopher Plummer, Tom Waits, Heath Ledger, and Lily Cole, follows the fantastical tale of a traveling theater troupe that lets its audience members transcend reality through a mirror with supernatural abilities. Titian-tressed beauty Cole, who plays the title character’s daughter, looked ethereal at the film’s Rome Film Festival premiere, in a black corset gown by Dolce & Gabbana that may have had some magical powers of its own.

Sex and the City 2 began filming last month—as evidenced by the images featuring the fabulous foursome decked out in ‘80s garb that recently surfaced. Kristin Davis ditched the fluorescent green getup seen on Charlotte, when the actress made an appearance on the Late Show with David Letterman last night, instead opting for an elegant LBD accessorized with a colorful embellished clutch.

Predictably, Stella McCartney’s spring 2010 show at Paris Fashion Week drew a heady array of boldface names: Sir Paul supported his designer daughter from the front row, as did Charlotte Rampling and pal Gwyneth Paltrow, who looked casually chic in a structured white blazer by McCartney and a pair of acid-wash jeans.