Taylor Swift's friends "don't trust" Calvin Harris.
The 'Bad Blood' hitmaker's pals are reportedly worried about the record producer's closeness with one of Taylor's best friend Gigi Hadid.
A source told US' OK! magazine: "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.
"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 Calvin 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."
Meanwhile, a source previously claimed Taylor and Calvin - who were recently named the highest-paid celebrity couple - had an "undeniable connection".
They said: "Taylor and Calvin are into each other in a big way. It's early days but there's an undeniable connection between them and they've been texting pretty much every day.
"They had a lot of fun in Las Vegas and she especially enjoyed hanging out after the show. Taylor has told friends she can't get him out of her head. Everyone thinks this could have serious potential."
See more images of Gigi Hadid and Taylor Swift in the gallery below.