attends a private view for the "Alexander McQueen: Savage Beauty" exhibition at Victoria & Albert Museum on March 12, 2015 in London, England.(Via Mike Marsland/WireImage/Getty Images)

The Alexander McQueen: Savage Beauty exhibition is at the Victoria & Albert Museum in London, and last night there was a private viewing where all of the celebs showed up in their best and most OTT Alexander McQueen creations. There were lots of revealing looks but Dianna Agron ended up showing more skin than she intended to when she suffered a nip slip when she was leaving the fashion gala.

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Diana was wearing a short-sleeved black Johanna Ortiz gown with a plunging neckline. She must not have used enough double-sided tape because when she was leaving the exhibition, her whole boob was visible from the side of her dress.Diana Agron Alexander McQueen Savage Beauty Nip Slip

(Via Mark Robert Milan/GC Images/Getty Images)

Despite the wardrobe malfunction, Dianna still looked gorgeous. She accessorized her black floor-length gown with matching black peep-toe high heels and a black clutch. She wore two multicolored Annina Vogel statement necklaces that brought out the light blue bow detail on her dress.

Dianna’s hair was styled in a deep side part with and just a hint of bedhead texture. Her locks are also slightly darker than the white blonde she dyed her hair in the summer. For her makeup, Dianna opted for black eyeshadow and neutral lips with complemented her dress. Overall, her look was very pretty. Hopefully next time Dianna will use a roll or two of double-sided tape so there won’t be any nipples trying to upstage her outfit.