Paris Hilton's relationship with DJ Afrojack is reportedly on the rocks.

The heiress and the music producer have been dating since November 2011, but friends have claimed Afrojack - whose real name is Nick van de Wall - has been so busy travelling for work that their relationship has suffered.

"Afrojack is extremely busy with his gigs and plays nightly at clubs all over the country, and Paris isn't going to go on the road with him and be a groupie," a source said.

Meanwhile, Paris is said to be jealous of former close pal Kim Kardashian's relationship with rapper Kanye West, both because it is going so well and because Kanye is a bigger star than Afrojack. "Adding to Paris' angst is that attention that Kim is getting from dating Kanye. Paris has been dating DJ Afrojack, but he's nowhere near the fame league that Kanye is in, and adding to that, the relationship has now cooled. He didn't accompany Paris to Cannes and he didn't go with her to Las Vegas for Memorial Day while he was working in Atlantic City," the source added.