Chris Martin had an affair with a Saturday Night Live assistant while he was still with Gwyneth Paltrow, the New York Post is reporting.

Martin appeared on the show in 2011 and according to the Post his romance with the woman was an open secret.

"He had an affair with a woman who was backstage and was part of an entourage. Everyone was talking about it because he was openly flirting with her at one of the show after-parties," a source told the Post.

"I don't rep Chris so I cannot address those accusations," Paltrow's rep told the newspaper, while Martin's rep didn't respond when asked for comment. Both reps had previously denied previous reports of other romantic dalliances.

As Breaking Celebrity News previously reported, though, the couple was said to have an "open" relationship. "If Chris was playing around Gwyneth didn't care," a source told Peo