Ryan Phillippe

Ryan Phillippe hit the streets in NYC last night filming Damages on location. He's been cast to portray an Internet activist, loosely based on WikiLeaks Editor in Chief Julian Assange, for the fifth and final season of the primetime drama. Ryan's not the only notable star joining the cast as Jenna Elfman's also committed to a reoccurring role. Work took a backseat to partying on Tuesday night when Ryan met up with Leonardo DiCaprio, Beyoncé, Jay-Z, and Kanye West for an A-list soiree at Manhattan's Darby Downstairs. Ryan's reportedly been considering a part-time move to the Big Apple since last Spring, but with a new baby girl, Kailani, as well as his two older kids Ava and Deacon in California, he'll always have a base on both coasts.

Cameron Diaz let loose last night with pals Naomi Campbell and Bar Refaeli at a special event held inside NYC's legendary Studio 54. The space, which is now closed, was opened for just one night by Sirius XM. Naomi also showed off her dance moves with her Russian boyfriend, Vladimir Doronin, and Ryan Phillippe was among the many men who turned out for the event. Bar evidently had a great time, as she later tweeted, "I went to studio 54 last night. I was born 25 years too late!"

It was Cameron's latest fun evening out since landing in the Big Apple just over a week ago — she and pal Gwyneth Paltrow watched football together Sunday at the West Village's Windsor sports bar following a Mexican dinner at Empellon. The ladies are both fresh off a fun and jam-packed stint in London. While in the UK, Gwyneth apparently aspired to do some matchmaking for newly single Cameron. Gwyneth tried to set up Cameron and Jude Law on a date, thinking the former Holiday costars should take advantage of both being single at the same, rare moment.

Jennifer Garner, Ashley Greene, and Olivia Wilde all made stunning and sexy entrances to Saturday night's Chrysalis Butterfly Ball in LA. The annual event raises awareness for the Chrysalis organization, which aims to create a better life for homeless and low-income families through job stability. Jennifer walked the red carpet without her significant other, Ben Affleck, though he did sneak inside and was spotted chatting up Vince Vaughn. Twilight's Ashley Greene decided on a bright shade of coral for the uplifting event after choosing a bright pink Michael Kors cocktail dress at last week's CFDA Awards. Olivia Wilde arrived solo before accepting an award from her Cowboys and Aliens director Jon Favreau. She tweeted her thanks to Jon and the organization, and was still reeling over her encounter with LL Cool J, who was also in the audience. Ryan Phillippe did a quick change and arrived in a well-tailored suit after spending the afternoon with his dog watching Deacon's flag football game alongside Reese Witherspoon and Jim Toth. Newly engaged Molly Sims stepped out on the arm of her fiancé Scott Stuber, showing off her gorgeous engagement ring. Chrysalis board member Rebecca Gayheart was joined by her Grey's Anatomy star husband Eric Dane while single lady Jamie-Lynn Sigler arrived in a sexy floral dress. Brothers and Sisters star Dave Annable escorted Odette Yustman and caught up with former costar Balthazar Getty who was joined by his wife Rosetta.

Matthew McConaughey and Ryan Phillippe brought The Lincoln Lawyer overseas today with a photocall in Paris. The costars first debuted their entertaining legal thriller stateside with a world premiere in LA last month. Ryan's real-life leading lady, Amanda Seyfried, didn't join him on the red carpet, but she did come along with MM and Ryan to France this weekend. The couple made time for some romance in the City of Lights before Ryan got back to business today. Matthew is traveling solo while Camila takes care of their kids at home, though she did come along to the East Coast a few weeks ago as he made the morning-show rounds.

Matthew McConaughey and Camila Alves hit the red carpet at Thursday's premiere of The Lincoln Lawyer in LA. Matthew and costar Ryan Phillippe had the support of friends like Pink, Marissa Miller, and the whole j.k.livin' staff at the event. Matthew revealed that he at one point thought he might actually go into law as a profession and loved doing research in actual city courthouses — check it out on PopSugar Rush! MM started promoting the movie this week with trips to NYC and Toronto, while Ryan kept his press close to home with a stop by The Ellen DeGeneres Show. The film hits cinemas next Friday, which means we'll have to wait a little longer to see MM and Ryan heat up the big screen, but you can catch an early glimpse of the good-looking duo in action in our exclusive pictures from the set.

Ryan Phillippe and Amanda Seyfried enjoyed a dinner date at Craig's in LA this week, before Amanda took her dog for a walk in Hollywood yesterday. Rumours suggested the couple split up last month after a short relationship, but it looks like they're still on. The Interview cover girl was quizzed about Ryan during her interview with Elle US, but would only agree that she had been "seen" with him. Amanda is busy promoting Red Riding Hood, with a premiere in LA on Monday where she talked about her producer, Leonardo DiCaprio. The actress also appeared on Regis and Kelly yesterday, chatting about her costars Colin Firth and Justin Timberlake.

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Colin Firth, Helena Bonham Carter and Tom Hooper cuddled up at the Weinsteins' Montblanc Cocktail Party at Soho House in West Hollywood last night. The King's Speech trio are hoping for success at today's Oscars, following their slew of BAFTAs. Colin arrived in LA last week with his wife Livia, who revealed to FabUK what she's wearing to the Oscars. They attended Tom Ford's store opening Thursday alongside Rachel Zoe and Alexander Skarsgard, who were also at last night's party. Other stars included Busy Philipps, Renee Zellweger, Jessica Szohr, Jennifer Lopez, and Marc Anthony. Emma Stone and Taylor Swift smiled together, and Chord Overstreeet and Dianna Agron brought Glee to the party. Kate Beckinsale was back to her usual hair colour after her blonde moment, while Gerard Butler hung with Adrien Brody again just like at the Dior dinner. Gorgeous guys like Ryan Phillippe, Stephen Moyer, and Chace Crawford posed for pictures too. The Sugar US team will be LIVE from the red carpet in just a few hours starting at 3:30 PST/6:30 EST, so watch on PopSugar and follow on Twitter for breaking news and photos.