Tracy Morgan surprised Jaguar execs by appearing at a party Wednesday to showcase the new F-Type. The Post’s Don Kaplan reports the cars parked in front of STK Steakhouse included a trio of Jags, among them a heritage C-Type and an XKR — which Morgan proceeded to mount like a stallion, spreading his stomach onto the hood. “Look, the Jag put a baby in me!” he crowed. Also there were auto aficionados Wyclef Jean and “Boardwalk Empire” star Michael K. Williams.