Rihanna Joins Kanye West & Jay-Z On 'Watch the Throne' Tour

　　Joining in on one of the biggest acts this year, Rihanna made her way on stage for a surprise performance with Kanye West and Jay-Z for their "Watch the Throne" tour in London.

　　The Barbadian beauty took to the London O2 Arena on Sunday night (May 20) wearing a cropped black top, skinny jeans and a beanie to perform "All Of The Lights" with Kanye as well as joining in on Jay-Z's hit "Run This Town."

　　After leaving the arena, the 24-year-old took to her Twitter page to let her 19 million-plus followers in on her exciting night tweeting, "Rihanna NAVi made historih tonight as the first person to Watch The Throne AND join it!!! No one is allowed on that stage! Thank u guys."

'Battleship' Capsizes With $25.3 Mil Launch, Universal Faces Big Loss

　　Universal and Hasbro Entertainment's big-budget Battleship barely left port in its North American launch, grossing a dismal $25.3 million.

　　That's well below the anticipated $35 million to $40 million that Universal and director Peter Berg were hoping for. Battleship, designed to put the studio squarely in the tentpole game, cost at least $209 million to produce, excluding a pricey marketing spend.

　　Battleship's international gross of $226.8 million provides some cushion, but it needed a strong domestic performance to end up in the black. A $25.3 million opening means the movie might not clear $70 million or $80 million over the long haul domestically, resulting in a notable loss for Universal and sparking plenty of Monday-morning quarterbacking within the studio about what went wrong.

　　There's already speculation that Battleship, starring Taylor Kitsch, Rihanna, Brooklyn Decker and Liam Neeson, will follow the same course as Disney's John Carter, which debuted to $30.2 million in March and topped out at $71.8 million domestically. Overseas, John Carter, also starring Kitsch, earned $200.6 million. The pic resulted in a $200 million write-down for Disney.

Rihanna's Late Night in NYC

　　Kicking off the week with some Big Apple fun, Rihanna was spotted out and about in New York City last night (May 14).

　　The "Take A Bow" songstress left her luxury hotel and headed off to a party, stopping to buy a rose along the way.

　　Earlier in the evening, Ri-Ri gave a fabulous live performance at the Robin Hood Foundation Benefit at the Jacob K Javits Convention Center.

　　Despite her recent heath scare, Rihanna sounded fabulous as she sang hits like “Only Girl (In the World), "Run This Town" and "Live Your Life."

Kristen Stewart & Robert Pattinson: Glamour UK's Best-Dressed of 2012

　　Kristen Stewart's had quite the banner year thus far, and now Kristen Stewart can add Best-Dressed Woman to her list of accolades as bestowed upon her by Glamour UK.

　　According to the publication, the "Twilight" star has earned the recognition due to her serious style transformation from the years before.

　　They write, "Whether she's working bodycon Monique Lhuillier on the red carpet, or dressing down in jeans and a T-shirt, Kristen is always effortlessly on-trend. Her evolution from awkward teen to style queen has made the Twilight star a fashion icon every girl can relate to."

　　Below are the names of top 10 women's and top 10 male's to be named to Glamour UK's Best-Dressed list.

　　1. Kristen Stewart
　　2. Emma Watson
　　3. Victoria Beckham
　　4. Kate Middleton
　　5. Florence Welch
　　6. Michelle Williams
　　7. Blake Lively
　　8. Cheryl Cole
　　9. Olivia Palermo
　　10. Rihanna
　　MEN TOP 10
　　1. Robert Pattinson
　　2. Ed Westwick
　　3. Gary Barlow
　　4. Johnny Depp
　　5. Ryan Gosling
　　6. Taylor Lautner
　　7. Tinie Tempah
　　8. David Beckham
　　9. Zac Efron
　　10. Will Smith

Pastel Hair Still Going Strong at Chanel

　　Just when we thought the pink (or blue or green) hair trend might be dying down—the look first started gaining traction over two years ago after Proenza Schouler's Spring 2010 show, after all—Lady Gaga debuted pastel-streaked hair last week. Then, today in Versailles, hairstylist Sam McKnight sent the Chanel Cruise 2013 models out onto the runway in pastel-colored pageboy crops, solidifying the fact that the trend still has legs.

　　Although it's not visibly apparent from the front, McKnight actually created what he called a "bob-top": "wigs dyed grey pastel then sliced in half to reveal low pony with massive bow," he explained on Twitter, to go with the show’s punk Marie Antoinette theme. Makeup artist Peter Phillips painted tiny interlocking-C logos on the models' faces, meanwhile, a tribute to Marie Antoinette’s signature beauty mark.

Rihanna's Mother's Day Love

　　Observing the holiday that gives thanks to the women who raised us, Rihanna treated her mom, Monica Braithwaite, to a delectable Mother's Day dinner on the town in New York City on Sunday evening (May 13).

　　Fresh off of a trip to the tattoo parlor, the 24-year-old donned a navy and white tummy-revealing ensemble while picking up a pretty bouquet of pink flowers to dote unto her mother during the course of their time together.

　　Earlier in the day, Rihanna was her usual busy self on Twitter while sending out a string of well-wishing messages to the moms, single dads and those who are without their moms.

　　Shooting out the more general words to follow, RiRi exclaimed, "Happy mother's day to all superwomen out thurr! Every day is your day. And a happy mother's day to all the dads doin it .

　　She then capped of the warm sentiments with, "Sending out special love to those who lost their mothers!

　　Meanwhile, Rihanna previously spoke with ELLE about her retired accountant mom's reliable nature, saying, “I still don’t know how she did it. She always protected us—she would never let us know when we had problems, even financially. I still got to go and get a perm every four weeks."

Rihanna Poses Topless in New Music Video

　　Rihanna shared sexy never-before-seen snapshots of herself getting ready for her animalistic music video, "Where Have You Been," on Facebook this weekend. RiRi's obviously not shy about showing off her hot bod! Plus, on Sunday Kim Kardashian tweeted an edgy pic from her Vogue Italia shoot, and Kylie and Kendall Jenner sported some rather controversial accessories on the red carpet Saturday night.