Taylor Swift and Calvin Harris have been seeing each other for six months and they seem to have a good thing going between them.

So good, in fact, that the 25-year-old superstar doesn't call the 31-year-old Scottish DJ by his stage name anymore, opting for the more intimate choice of using his real name Adam.

"Taylor always calls Calvin by his birth name, Adam, and never Calvin in private," a close source told Us Weekly.

The source continues: "Taylor gets all dressed and glammed up whenever she is going to see him to look her best."

The hit-maker has been in the spotlight many times for her equally big-name boyfriends, including Harry Styles, Conor Kennedy, Jake Gyllenhaal, John Mayer, and Joe Jonas. She seems to be extra taken by Harris, however.

"She's head over heels," the source confides. "She hasn't been in love like this before!"

Harris seems just as happy with Swift.

He has happily escorted her to various engagements and events, these past few months, the most recent being the Billboard Music Awards in May. In July, he shared with KISS FM UK: "It's going absolutely fantastic. It's interesting, because obviously there's different things written about it every day and even if we don't do anything publicly for a while, someone will make something up."

Harris has also played Swift's knight in shining armor, coming to Swift's defense in a heated Twitter fight with ex-One Directioner Zayn Malik.

Before he dated Swift, Harris had been linked to Anne V, Russian supermodel and a judge for The Face.

His other romances have been with Rita Ora the British singer, and model Aarika Wolf.