The singer puts on an eye-popping performance in Boston. Plus: Lindsay Lohan, Nicole Richie and more

THREE'S COMPANY

It's a girls' night out! Liv Tyler and Kate Hudson get some face time with pal Stella McCartney on Monday at the "Model As Muse: Embodying Fashion" Costume Institute Gala at New York City's Metropolitan Museum of Art. The designer dressed both of the actresses for the A-list event.

See more of the Met Gala's Best Dressed!