Paris Hilton, boyfriend River Viiperi stay low-key in Barcelona

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Paris Hilton and her model boyfriend River Viiperi are keeping their relationship under the radar as best they can. The low-key couple visited Barcelona recently so that Viiperi could walk in a fashion show for clothing designer Mango. Hilton reportedly skipped the photo call so she could just watch her man work.

TMZ has photos showing Hilton looking on as her 21-year-old boyfriend walks the catwalk for Mango. This isn't the first time Hilton, 31, and Viiperi have been spotted together recently, either. They've made appearances at one another's sides at the Sundance Film Festival and at the People's Choice Awards in January.

"Good morning everyone. Getting ready for another day in Barcelona with @RiverViiperi. Hope everyone has a great day!" Hilton tweeted, also posting a photo of them hanging out backstage at Barcelona Fashion Week. When someone commented that she is "such a good gf," Viiperi tweeted, "The best."

Hilton and Viiperi started dating in September 2012. If you recognize Viiperi's face, it's likely because you've seen some of his work for Ralph Lauren, H&M and Calvin Klein. He is reportedly one of the 50 best-paid models in the world.

Photo/Video credit: Getty Images