The couple went public with their relationship on the most recent instalment of the "Little Known Facts with Ilana Levine" podcast, which the pair recorded while self-isolating together.
"Ben and I are dating," Noah said. "I asked him this morning, I was like, are we allowed to talk about this? And he's like, 'Don't go into our nitty-gritty, but yeah, people can know.' It's still relatively new."
Ben starred in the title role in the musical from 2016 to 2017 before Noah replaced him in the show. The "Booksmart" star quipped the cast was "incestuous" - seemingly alluding to the fact that the musical's third Evan, Taylor Trensch, is also dating the show's national tour star, Ben Levi Ross.
"But it makes sense, like, we all went through the war together," he added. "We all feel very connected."