Pop star Selena Gomez says she offers singer Taylor Swift advice in "the boy department".

The "Good for you" hitmaker spoke about her friendship with Swift in an interview with Instyle UK magazine, reports usmagazine.com.

"People have this fantasy that we're in our underwear, having pillow fights," the 23-year-old said in the magazine's January 2016 cover story.

"We just play good music - sometimes live - and eat, and hang out."

She also admitted that she offers the "Bad Blood" singer advice in "the boy department" while Swift, 25, stops her from being too hard on herself.

"I'll be like, 'I think I totally screwed up', but Taylor says, 'Actually, you didn't' and shows me how to make my mistakes into something great," she said.

Gomez, who sparked rumours of a reconciliation with her former boyfriend Justin Bieber, 21, when he was spotted singing to her at a hotel bar in Beverly Hills, California, on November 20, seemed to get a little annoyed when the magazine asked her about their relationship.

"It's really hard because I'm a nice person. I'm just tired of talking about it," she said. "I never intended for my life to become a tabloid story."