It was a night of the stars at the annual Costume Institute Gala Met Ball in NYC tonight — also known as the fashion world’s Oscars. But fashionistas took a backseat to pop icon Bruno Mars, who brought down the house with a surprise performance that included covers of “Roxanne” by The Police and “Dirty Diana” by Michael Jackson. Among the smitten starlets? Rachel Zoe, Sofia Vergara, Kate Bosworth, Karen Elson, and Mars’s not-so-secret crush, Rosario Dawson.

https://twitter.com/#!/womensweardaily/status/199693845649309696

https://twitter.com/#!/rosariodawson/status/199689957831491585

https://twitter.com/#!/SofiaVergara/status/199688810483826688

https://twitter.com/#!/RachelZoe/status/199691131469045760

https://twitter.com/#!/joejonas/status/199705339531231233

https://twitter.com/#!/KarenElsonMusic/status/199688947201351680

https://twitter.com/#!/MarcJacobsIntl/status/199700082159927297

https://twitter.com/#!/katebosworth/status/199689990710628354

Bruno’s brother, who plays drums for the band, tweeted, too:

https://twitter.com/#!/mrEricHernandez/status/199703821751029760

Diehard fans — “Hooligans” — enjoyed the Twitter love for Bruno. And his hair:

https://twitter.com/#!/ChrystalMars/status/199715131725320192

https://twitter.com/#!/SunShineSparkL/status/199716368441016322

Impossible conversations! @brunomars singing Roxanne! #Metgala  on Twitpic