THINGS seem to be heating up between Renee Zellweger (above) and Bradley Cooper. The “Case 39” co-stars were photographed Saturday at JFK Airport boarding a flight to Barcelona. The couple, who have yet to confirm they’re a couple, had dinner at Italian eatery Antonucci last month and have since been spotted together at the Smyth Hotel in TriBeCa and in West Hollywood. Zellweger’s rep didn’t get back to us.