The Met's Costume Institute Gala on Monday night boasted a star-studded red carpet with more unique designs draped over celebs than at your typical awards show. Fittingly, Lady Gaga was set to perform for the decked out A-list crowd, but oddly, she was nowhere to be seen on the red carpet. Which is sort of... unlike her?

The Fame Monster snuck in unseen, and now the NY Post reports that she promptly locked herself in her dressing room. The paper reports back that "she refused to walk the red carpet and remained locked inside her dressing room for most of the evening." Eventually artist Terence Koh (via telephone) and Oprah Winfrey coaxed her out. Once on stage she told the crowd (which included Bono, who left during her set): "I'll never forget when Anna Wintour called me to play at this event, she called me and said, 'I would like you to play at the Met gala, but I just want to make sure, because I've seen you perform before, that you won't be swearing during the performance." She told the Vogue editrix on stage, "I'll do my fucking best."

But why no crazy orbital headdress fashionvaganza on the red carpet? We're going to assume she showed up wearing the same dress as Katy Perry. Embarrassing.