33-year-old Gubler was a special guest at Swift's bash in Rhode Island but she was apparently trying to keep the romance under wraps, reported Showbizspy.
"Taylor is nuts about Matthew. She posted photographs from the party on her blog that showed her backup dancers, but Matthew's picture was conspicuously absent. It was as if Taylor was purposefully trying to keep his presence there on the downlow.
"Taylor's trying to keep the whole relationship with Matthew secret for now. That's why she's saying they're just friends. The truth is, she wants to get to know him better before they take the relationship public," a source said.