Metropolitan Museum of Art Costume Institute gala fashion: So hot or so not?

<b>Met Costume Gala Fashion    </b> It's one of the biggest red carpets of the year as Hollywood's elite step out to show off their boldest fashion choices at the Metropolitan Museum of Art Institute Costume gala. And while many of the stars wear fashion that can stop you in their tracks, it's not always for good reason. See who wowed and who fell flat on the red carpet Monday.  (From L to R, Jessica Alba, Gwyneth Paltrow and Beyonce) (AP)

Mary Kate Olsen: So, so not! (AP)

Rosie Huntington Whiteley: So hot! (AP)

Lana del Ray: So not! (Is that a witch cape?) (AP)

Rihanna: So hot! (AP)

Elizabeth Banks: So not! (AP)

Tim Tebow: So hot! (AP)

Anna Wintour: So not. (AP)

Jessica Alba: So hot! (AP)

Beyonce: So not! (AP)

Tom Brady and Gisele Bundchen: So hot (minus his ridiculous hair). (AP)

Amber Heard: So hot! (AP)

Kristen Stewart: So not! (AP)

Camilla Belle: So hot! (AP)

Rooney Mara: So not! (AP)

Solange Knowles: So hot! (AP)

Melania Trump: So not! (AP)

Julianne Hough: So hot! (AP)

January Jones: So not! (AP)

Gwyneth Paltrow: So not! (AP)

Katharine McPhee: So hot! (AP )

Florence Welch: So not! (AP)

Chanel Iman: So not! (AP)