"Things are really heating up and they are growing very, very close while getting to know each other. Everyone that is close to the couple really thinks this is it for the two of them."
But wait, there's more! Those who know the duo best also are privy to the fact that "they just work really well and want to spend every minute they have free together. Both families love seeing them so happy."
And speaking of families, considering how serious Cooper and Shayk are getting, could there already be rumblings of a wee one in the couple's future?
"They both want kids one day and that's been discussed between them," our source admits, adding, "They have a huge attraction to each other between their personalities and their sexual energies. You see them in a room and you immediately are in love with them as a couple."
Aw, it sounds like these two are in it for the long haul after all!
Cooper and Shayk were first linked back in early May after photos surfaced showing the two holding hands and kissing while strolling through the New York City.
Neither has spoken publicly about their blossoming relationship, however, nor walked a red carpet together despite attending several of the same events.
Watch: Inside Irina Shayk's Stunning 2015 Met Gala Fitting