The 98 Degrees hitmaker briefly romanced Kardashian, who is now pregnant with rapper Kanye West's baby, over seven years ago and Lachey suggests the fashion designer once tipped off a pack of photographers so their movie outing would be well-documented in the tabloids.
The couple's relationship only lasted a short while, but when asked whether the What's Left of Me singer, who is now married to Vanessa Minnillo, had a hand in making Kardashian famous, he tells Details magazine, "That's one way to interpret it."
He adds, "Let's just say this: We went to a movie. No one followed us there. Somehow, mysteriously, when we left, there were 30 photographers waiting outside.
"There are certain ways to play this game, and some people play it well."