As we reported, Ariana was not wearing her wedding ring at Wimbledon over the weekend ... in fact, she's been ringless a lot these days.
We're told a few months back the 2 tried a reconciliation, but it failed.
One source with direct knowledge told TMZ, their relationship "is heading for divorce."
Ariana and Dalton have been thousands of miles apart since December, when she started filming "Wicked." Our sources say they were having problems even before that.
We're told they remain friends and still talk on the phone regularly, but, according to sources, the marriage is kaput.
It was early 2020 when we first saw the two of them making out at dinner at Bar Louie in Northridge, CA. At the time, no one really knew who Dalton was or how serious the couple's relationship had gotten.
The couple tied the knot in May 2021 in a very private ceremony at Ariana's home in Montecito.