Justin Timberlake and Mila Kunis stepped out for the NYC premiere of Friends With Benefits at the Ziegfeld Theater tonight. Mila was back in a sexy red dress after donning the fiery color for an appearance on The Today Show with Justin this morning. She changed into a gray Roland Mouret number to sit down with Jimmy Fallon this evening before hitting the red carpet with her costar. Emma Stone was also on hand for the event and she posed with Mila on her way into the screening. It's been a busy month for Mila and Justin, who have been promoting their movie with a spread in Elle, a trip to Mexico, and a press junket.

Ciara tied on a sexy string bikini covered in pink sequins as she took a dip in Miami Beach today. The singer is one of several celebrities taking advantage of the scene in Florida during Mercedes-Benz Fashion Week's 2012 Swim Week. Whitney Port and Kristin Cavallari have also gotten in on the action, hitting the beaches, pools, runway shows, and parties. Ciara enjoyed some R&R this afternoon, but her trip wasn't all play. She also performed at the first of 10 Summer concert tour dates in Miami over the weekend. The pop star, who is joining Taio Cruz for the series of shows, also might be heading back to the recording booth soon. Ciara is one of several artists expected to join Epic Label Group now that music industry veteran L.A. Reid has taken over.

Katie Holmes was in her bikini yesterday to lounge by the pool in Miami, and her husband Tom Cruise stopped by to get a hug and kiss from Katie Holmes! The happy couple, along with daughter Suri, spent the afternoon getting sun and splashing around together. Tom was also spotted over the weekend channeling his Rock of Ages character Stacee Jaxx by rocking out shirtless on their room's balcony. Some lucky fans will get to see Tom's smooth moves in person — 5,000 extras are needed for a massive stadium scene at 1 p.m. today at Sun Life Stadium in Miami Gardens! Tom said playing a rock star is great fun during an interview with his costar Julianne Hough's boyfriend Ryan Seacrest last week. Tom said, "I’ve always loved music, but . . . there’s nothing like doing something yourself to give you a greater appreciation for what this art form is, and it’s fantastic.”

Whitney Port made a splash in Miami this afternoon, wearing a bright, floral-print bikini as she swam in the warm water. The designer and reality star has been enjoying some time in Florida during Mercedes-Benz Fashion Week's 2012 Swim Week. Whitney has been hosting parties, checking out some of the runway shows, and catching rays in a rotating wardrobe of two-pieces. Whitney wore a white Mara Hoffman bikini over the weekend before stepping out in her bold swimsuit today. She showed off an enviably fit frame, and the reality star recently shared some of her workout tips with fans. In fact, one of Whitney Port's fitness secrets is packing in a few push-ups before going out on the town, which she says gives her a big energy boost.

Nicole Richie slipped into her trademark bell bottoms and stopped by a friend's house in West Hollywood on Saturday. The busy mom has been hanging with her loved ones this Summer, including on Fourth of July at the beach. A busy Fall is just around the corner for Nicole, since her first House of Harlow bag collection hits stores and she plans to appear on NBC's Fashion Star with Jessica Simpson. Nicole and husband Joel's brother Benji Madden have teamed up on a joint venture. Nicole and Benji asked for relationship advice questions on her webpage, to give both the male and female perspectives on issues troubling fans. Joel Madden's new Tumblr is also in action, and yesterday he posted photos from Good Charlotte's tour and quiet family moments.