"Taylor kept on making an effort to flirt with Douglas, but he gave her the cold shoulder and was extremely dismissive towards her," says our insider. "She would get a drink and then approach him; she would chat with [actress] Hailee Steinfeld and then re-approach him; she was even trying to chat him up near the flowers on display. It was all very funny for those of us watching," says our snitch.

But it was to no avail. Our spies say Swift looked dejected at his lack of interest and was overheard in the ladies' room telling Steinfeld about her disappointment.

"Taylor and Hailee were chatting about Douglas while they all touched up their makeup," says our source. "Taylor was whining and complaining about his aloofness toward her. She looked like an animal circling its prey, when she tried to get his attention."