Several of Hollywood's hottest celebrity couples attended last night's Costume Institute Gala at the Metropolitan Museum of Art in New York City. Gwen Stefani, accompanied by husband Gavin Rossdale, wore an unusual, partially see-through white dress from her own line, L.A.M.B.; while Jessica Biel, who attended with boyfriend Justin Timberlake, opted for an off-white silky Ralph Lauren gown.

Gisele Bundchen went for an edgier look with a black fringe Alexander Wang frock; as she was accompanied by husband Tom Brady. And Sienna Miller, using the event to also go public with her rekindled romance with Jude Law, rchose a blue Emilio Pucci halterneck dress that showed off both her cleavage and her legs.

Finally, Naomi Watts picked a bright fuchsia Stella McCartney one ruffled shoulder dress, while Ivanka Trump picked a pastel purple strapless Christian Siriano gown. Watts was accompanied by long time beau Liev Schreiber, and Trump attended with her husband, Jared Kushner, who owns The New York Observer newspaper.

Which couple looks the best?