If sticking out her tongue at them was any indication, an insider said Taylor Swift does not approve of her best friend Selena Gomez getting back together with ex-boyfriend Justin Bieber.  

Swift is cautious of her friend rekindling a romance with Bieber, which could involve a lot of drama since the pair have already been rumored to be on-again, off-again for some time now. Gomez admitted that she had a rollercoaster of a relationship with Bieber when they dated in 2012. She told InStyle's June 2013 issue dating the Canadian singer was "crazy and very intense."

Swift may be worried about her friend getting into an unhealthy relationship with Bieber, but a source said she also feels a bit jealous.

"Let's just put it this way: Taylor is not a Belieber. She loves Selena and wants her to be happy but she doesn't think going back and forth with Justin is the answer," the source said. "That being said, Taylor's also a little bit jealous in a weird way."

Swift is reportedly jealous that Gomez "still has Justin as 'her person' to go to," but the country singer is "not jealous of who Selena's on and off with."

"She thinks Justin is a brat and that Selena could do way better," the insider added.

Swift expressed her distaste for Bieber at the 2013 Billboard Music Awards on Sunday. When Gomez and the Boyfriend singer shared a kiss and hug backstage, Swift saw the whole thing and stuck out her tongue at the sight, showing her disgust. After the awards ceremony was over, when she stopped to take questions from the press, she refused to answer anything having to do with Bieber. 

The embrace was caught on camera from but the video has since been removed from YouTube. 

Tags: Justin Bieber Selena Gomez Taylor Swift