Black-tie benefits and film screenings kept this crew of celebrities very busy, not to mention, impeccably dressed, throughout the weekend. Last night, styled celebs gathered for a good cause, stepping out in Hollywood to support the Trevor Project, which provides support to lesbian, gay, and transgender youth. Among the attendees, we spotted the lovely Zoe Saldana  in a printed mini, while Amber Heard took an elegant approach in a creamy white gown. In DC, Sarah Jessica Parker  made a glamorous arrival at the 34th Kennedy Center Honors event, joining a newly engaged and glowing Anne Hathaway  for last night's festivities. But that's not even the half of it — fashion darling Olivia Palermo hit the red carpet with Madonna  for an NYC film screening, and Katy Perry  donned white-hot Versace for the annual Change Begins Within benefit in LA. Click on for all of this weekend's red-carpet action.
Sarah Jessica Parker  made a chic arrival in a black Theyskens’s Theory gown at the 34th Kennedy Center Honors event in Washington, DC.
Rachel Roy mixed a colorblocked turtleneck and a sleek black cocktail dress at the Cinema Society and Piaget screening of W.E.
Fergie  stepped out in an embellished feather-trimmed mini for the Trevor Project's Trevor Live event.
Emily Blunt  opted for brilliant color at the Kennedy Center Honors event.
Madonna  struck at pose in an embellished top and jacket at a film screening of W.E.
Katy Perry  joined hubby Russell Brand  and wore a stud-embellished white Versace sheath at the third annual Change Begins Within benefit in LA.
Jayma Mays took the sophisticated route in a gray shift dress with beautiful embellished sleeves at Trevor Live.
Rashida Jones went for bold color in a pretty black and purple party dress at Trevor Live.
LeAnn Rimes dressed up in a bold-hued, emerald green frock and equally bold wedges at Trevor Live.
Glee's Dianna Agron  opted for an elegant black halter dress at Trevor's event.
Nina Garcia channeled a sophisticated look in all black for the W.E. screening.
Amber Riley looked sweet in a red party dress and bow-adorned bright pink heels for the Trevor event.
Funny lady Amy Poehler  looked superchic in a simple black sheath for Trevor Live.
Julie Bowen stepped out in a slick leather sheath dress for the Trevor event.
Donna Karan mixed black separates and eclectic jewels at the W.E. film screening.
Kat Dennings opted for a pretty, printed little mini dress at Trevor.
Michelle Trachtenberg  selected a sophisticated seasonal evening look for the Cinema Society and Piaget film screening.
Christina Hendricks got into the holiday spirit in a red sequined cardigan and pencil skirt at Trevor.
Anne Hathaway  looked ultraelegant in a black Giambattista Valli gown at the Kennedy Center Honors event.
Chloë Sevigny  chose a bold, asymmetrical red sheath and booties for the W.E. film screening.
Julianne Hough channeled Hollywood glamour in an embellished sheath at Trevor Live.
Olivia Palermo mixed fur and delicate sheer fabric for a chic evening look at the Cinema Society and Piaget film screening.
Zoe Saldana  opted for a geometric-print minidress at Trevor Live.
Amber Heard looked utterly chic in a white short-sleeve gown at Trevor Live in Hollywood.