However, according to Kristen, the two have been together since then.
Last month, in an interview with In Touch Weekly, Kristen claimed she and Tom shared a kiss in New York City after filming an episode of "Watch What Happens Live."
Immediately after the interview went public, Tom denied claims, saying that he rejected his ex-girlfriend's advances. And now, Ariana is speaking out, claiming Kristen's allegations are "complete nonsense."
“I know Tom so well and I have so much confidence in him," Ariana told Radar Online on March 7. "Logically, I know about that whole night and I know her story is not true. It’s so far from reality. There’s nothing that she can say that I would believe."
Although their romance is new, Ariana and Tom have known each other for years as friends, which seems to hint that they have a lot of trust in one another.
Ariana added, "She is just desperate to bring people down!”