Baby X has finally arrived on the New York art scene.

Brooklyn conceptual artist Marni Kotak delivered her biggest performance ever — giving birth before an audience at an art gallery in Bushwick.

Baby boy Ajax weighed in at 9 pounds, 2 ounces and measured 21 inches long.

Kotak, 36, said she wanted to show that giving birth was the “highest form of art.” At 10:17 a.m. Tuesday she treated a crowd of about 20 to her new creation.

“The atmosphere inside the gallery was magical,” blogger Katarina Hybenova wrote at Bush-wickDaily.com. “I believe that all of the participants were deeply moved by this emotional, raw and true ‘piece of art’ … Everyone was also very helpful.”

Yesterday, mom and baby were resting comfortably at home, said her husband, Jason Bell.