Chris Brown

The fun wasn't over for the Met Gala 2013 attendees in NYC last night as they flocked to the Standard Hotel following the ball for the official afterparty at the Boom Boom Room. Madonna stripped out of her bum-baring Met Gala outfit and changed into a fishnet body stocking and black lacy lingerie to mingle with guests like Katy Perry, Allison Williams, and Frank Ocean. She wasn't the only star who made a costume change — Amanda Seyfried took off her gown and changed into a baggy black t-shirt to hit the dance floor with Frank. Meanwhile, Miranda Kerr met up with January Jones, Jennifer Lawrence arrived with Marion Cotillard, Gerard Butler mingled with Karolina Kurkova, andNicole Richie connected with Kirsten Dunst, and Mary-Kate Olsen snuggled with boyfriend Olivier Sarkozy. Mary-Kate and Olivier weren't the only couple at the late-night bash, as Jennifer Morrison was spotted holding hands with her Once Upon a Time costar Sebastian Stan and Kate Bosworth hugged Michael Polish. If you missed out on all the excitement last night, be sure to check out our collection of all the red carpet fashion from the 2013 Met Gala to get caught up!

Rihanna held hands with Chris Brown in Hawaii yesterday. She wore a tiny pink bikini with a black fishnet cover-up for a special occasion — yesterday was her 25th birthday. Rihanna was apparently in good spirits, tweeting, "Epic day already, I woke up to sunshine in paradise and 'Stay' jumped 54 spots to number 3 on the Billboard Hot 100!"

Apart from turning 25, Rihanna has big projects to celebrate. Rihanna debuted her first clothing collection for River Island during London Fashion Week. She will also delve into the world of beauty. Rihanna will collaborate with MAC to launch her own line of makeup for the brand, which is due to hit stores later this year.

The Grammy Awards brought some of the biggest names in music together in LA last night, but the afterparties got those stars in a celebratory mood. Rihanna changed out of the custom Azzedine Alaïa frock she wore to the big event and into a belly-baring white dress to attend an afterparty at the Supperclub with Chris Brown. Meanwhile, Justin Timberlake hosted a private event at the Hollywood Palladium, where he performed in front of an excited crowd. His post-Grammys show would mark one of several gigs that night — he also made a splashy return to performing on TV at the Grammys earlier that evening. Justin and Rihanna's parties weren't the only big shindigs for the night. Selena Gomez, Katy Perry, John Mayer, and Lena Dunham were all spotted enjoying the town after the Grammys festivities.

Rihanna and Chris Brown may have walked the Grammys red carpet separately, but they met up inside the Staples Center once the show got started. It's been a busy weekend for the duo, who were also together at the Roc Nation pre-Grammys brunch on Saturday. Rihanna and Chris are spending time more together lately, though they have yet to comment on the official status of their relationship. Both Rihanna and Chris are up for awards tonight, and Rihanna will also take the stage to perform.

Rihanna and Chris Brown cuddled close and shared tons of laughs at the Christmas Day LA Lakers game at Staples Center on Tuesday. Rihanna sipped on a beer and rested her head on Chris's shoulders as they watched the Lakers win. Rihanna ended her Barbados vacation in time to join Chris courtside for the holiday. Rihanna and Chris have yet to officially state that they are back together, but they have been going more and more public with their rekindled romance. Rihanna has shared a number of pictures of herself and Chris looking intimate on Instagram in recent weeks. Rihanna slipped into a bikini for a getaway to see friends and family earlier in the weekend, but she made sure to be with Chris on Dec. 25.