Taylor Swift's "I See Fire" duet with Ed Sheeran has caught the attention of fans around the world - some are left wondering if new tracks with the English singer are underway.

"Berlin, you were a DREAM!! AND @edsheeran came along to surprise you with 'I See Fire'. Thank you for being wonderful," the "Red" singer posted on Twitter.

Taylor Swift is preparing to produce new tracks that diss Justin Bieber after he disrespected her on his "All Bad" song, HollywoofLife.com reports.

A source revealed to the website that the "Red" singer is not backing down from his original comments about her and will retaliate with her own songs.

"She has heard the song, and she is definitely going to respond at some point," the source told the site.

"She has the mentality now that payback is a b**ch. A song about him has no timetable but it's inevitable."

Taylor Swift revealed during a recent interview with Glamour magazine that she is spending more time with best friend Selena Gomez as she writes new songs, leaving many fans wondering if she will produce a piece about the "Slow Down" singer's battle with drugs before rehab.

Selena Gomez revealed she voluntarily spent time at The Meadows recovery center in Arizona in January for two weeks, the New York Daily News reports, leaving many fans wondering if she's considering retiring with Justin Bieber.

"Selena voluntarily spent time at Meadows but not for substance abuse," her rep said in a statement, the New York Daily News also reports.

A source revealed that Selena Gomez frequently mentioned Justin Bieber during her rehabilitation and discussed how he pressured her to try drugs, HollywoodLife.com reports.

"She finally gave into pressure and started smoking weed with Justin," the source said, according to the site.

"His house was the first place she tried it."