Hey, haters: Leave Kim Kardashian alone! That's the message that Kanye West shared with the A-list list attendees inside NYC's Metropolitan Museum of Art as he performed a new song during the annual Costume Institute Gala. With his seven-months-pregnant girlfriend looking on, the rapper, 35, debuted a track that was "an ode to Kim . . .about how awesome she is," an insider explained to Us. "The audience was jamming to it. Kim was smiling and loving it."

Another fan? Supermodel Coco Rocha, who shared a Vine of West's performance. "Kanye telling Kim not to worry what anyone says that she's awesome. Quite touching really."

By all accounts, Kardashian, 32, had a fantastic night. The reality star emphasized her baby bump in a Givenchy by Riccardo Tisci gown: A long, floral print gown with high slit plus matching, built-in gloves and sandals. Sharing her own snapshot of West's performance, she returned the compliment: "Baby you're AWESOME." Among other instagram snapshots, Kardashian shared a huge group shot, where the famous couple are surrounded by other revelers (some of them flipping off the camera playfully). "Night at the Musuem," Kardashian wrote in lieu of a caption.

Click here to view the live stream (+ archived version) of the 2013 Met Gala on Vogue.com.