A new report says the two are on the outs after the One Direction singer cheated on her with a fashion stylist named Pandora Lennard.
The UK-based The Sun said the stylist was at Harry's house last week and didn't leave until noon the following day.
Just last week, there was a report claiming that Kendall and Harry were taking the next step in their relationship and they had decided to move in together. That report came after the two were spotted celebrating the holidays together in St. Barths.
"I have absolutely no comment to make," Pandora told The Sun when asked about Harry.
A source close to both Harry and Pandora said, "Everyone knew they were attracted to each other and they have been pals for a while. But we didn't think anything would happen as Harry and Kendall are officially an item. This is gobsmacking."
Over the weekend, Kendall was seen leaving music manager Jeff Azoff's birthday in Los Angeles, after canceling a modeling gig to be there. Harry was also there, but the two didn't arrive or leave together.
"It doesn't look good for Kendall and Harry. She canceled a modeling gig the other side of the world to be at Jeff's birthday," a source told The Sun, before adding "she didn't look happy on arrival."
Another source said, "Kendall and Harry spoke at the event and were civil to each other."
The same source said Kendall and Harry were "miles apart from each other," at the party.
The newspaper said Kendall left the party when Harry took to the microphone to roast the birthday boy.
The rumored couple never confirmed their status, but Kendall's sister Khloe Kardashian said she believes that the two are an item.
"Do I think they're dating? Yes," she told Entertainment Tonight. "I don't know if they're like boyfriend-girlfriend. Nowadays I don't know. People are weird with stuff. So, I don't know their title. But I mean, they were in St. Barts together hanging out, so to me that's dating."
She continued, "I would call that dating. I don't know what they are. You know, you have the have 'the talk.' I don't know if they've had that talk yet."
A source also told ET, "Kendall doesn't want to get hurt, so she's proceeding with caution. She knows what the deal is."
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