"Calvin has shown a sudden interest in Gigi. Taylor's friends started to notice that he was pursuing a friendship with her. They don't trust him, but they're trying to support Taylor because they know how much she's in love with him," a source said.
"Calvin has been liking Gigi's pictures and her selfies on Instagram the minute they're posted.
The 25-year-old singer is believed to have confronted Harris about his and the 20-year-old model's growing friendship, where he said he was just texting her about a "major role in his music video," something he is "really excited about," reported OK! magazine.