"He gets along with her friends. They all like him and there's no drama," says a source

By Melody Chiu
Updated March 30, 2016 08:35 AM
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Whether he’s celebrating Taylor Swift‘s big Grammy win with Lorde, cooking in the kitchen with her best pal Karlie Kloss or building a snowman with her younger brother Austin, Calvin Harris seems to have won over everyone in his girlfriend’s life.

“They’re super happy together,” a source tells PEOPLE exclusively about the couple, who just celebrated one year together. “He gets along with her friends. They all like him and there’s no drama.”

Before dating Harris, the “New Romantics” singer was single for two years and built a strong group of female friends who have stayed by her side.

For more on Taylor Swift and Calvin Harris’ romance, pick up the latest issue of PEOPLE, on newsstands Friday.

“They’re not a couple who are joined at the hip,” says another insider. “They enjoy romantic date nights when they are off, but both Taylor and Calvin have many friends they hang out with separately. Her girlfriends seem very important to Taylor.”

The deejay/producer has also made an effort to get to know Swift’s close-knit family, including her brother Austin.

“He spends a lot of time with them,” says the insider. “He gets along great with Taylor’s brother, and it’s very obvious that her parents really like Calvin.”