A-List Stars Attend Met Costume Gala

Justin Timberlake, Victoria Beckham, and Katy Perry were among the many stars that attended the annual Metropolitan Museum Costume Institute Benefit in New York last night, PEOPLE reports. Celebs donned their most extravagant fashions for the "Model as Muse: Embodying Fashion"-themed event.

Rihanna stepped out for the first official time since her February domestic violence incident with Chris Brown in a daring tuxedo-inspired Dolce & Gabbana ensemble, drawing raves from Twitterers:

1. 
   mrswindycity Rihanna at the Costume Institute Gala...I loved it: I think Rihanna was appropriate and stunning.
2. 
   xoPearl OMG!...only Rihanna could pull this one...http://tinyurl.com/df2r6g (FIERCE!)
3. 
   alishadsc ok rihanna's ENTIRE style has officially been inspired by prince
4. 
   klucassm @DoubleXMag Rihanna was HOT in that tux. Amazingly so. She's donned weirdo outfits and genderf*cky stuff before so it isn't out of the blue.

The Twitterverse wasn't as keen on Madonna's Louis Vuitton mini-dress and pointy headpiece:

1. 
   Modern_Domestic Not digging a lot of the "looks" in the Times Met Gala photos. Esp. Madonna, Katy Perry & Brooke Shields:
2. 
   judithsthoughts @BruinBrian seriously. ugh. i hope lady gaga doesnt feel like her pantless fashion has now been vindicated by madonna.
3. 
   opethestylist @Parmie Madonna was thinking that she was one of the models on the runway. She went a bit too far but it made for interesting fashion. ;-D
4. 
   ZSylvester http://twitpic.com/4m5sr Madonna was a hot mess at the Costume Institute Gala...eeeek!!

You can see many celebrities and their outfits in PEOPLE.com's video coverage.

Madonna Injured in Horse Accident

Madonna suffered an injury while horseback riding today in New York. She was briefly hospitalized and released but will need to undergo more tests in the future, according to her publicist.

While very few details about the accident were given, it seems Madonna fell from the horse after it was startled by paparazzi, the publicist said.

Twitter users expressed their concern for the pop icon:

1. 
   SpicyGRITS the horse Madonna was riding was startled by papparazzi who jumped out ot the bushes to photograph -- this is disgusting!
2. 
   mizhollywd Madonna fell of a horse today while horseback riding and was taken to the hospital...hope she is ok
3. 
   Sjonster Clearly the paparazzi didn't learn their lesson from Princess Di. Madonna's accident could have been much worse!
4. 
   thingy65 @RyanSeacrest the site didn't say if the horse is okay. I'm a Madonna fan and if she was released she is probably ok hope the horse is ok!
5. 
   mistercristofer So Madonna fell off another horse. No injury this time though, just a fright. Hope she'll be fine still in a few days. After-shock sucks!
6. 
   nanamojo I'm glad Madonna was not hurt to badly the papp needs his A** thrown in jail!
7. 
   panamaqueen Papparazzi strike again, scared Madonna's horse, and she was injured, these people can be a menace. More publicity for Madonna too.