Coachella isn't complete until you've had at least one awkward encounter, right?!
An insider tells E! News that the two "didn't speak to each other, but both definitely saw each other" and that the whole experience was "extremely awkward."
Our source added, "He was cool, she was cool and they just kept moving along."
Coachella run-ins shouldn't be anything new to both Ross and Pattinson.
The two actors split less than two months later, just a year after photos surfaced of Stewart with her Snow White and the Huntsman director, and Ross' husband, Rupert Sanders.
Late last year, Ross opened up about the incident in Vanity Fair, saying, "It was horrible. It was really the worst."
She continued, "I have no words to describe what we went through. But I think, for me, something always has to completely die for there to be a rebirth. And I feel like I'm going through a rebirth."
Liberty filed for divorce from Rupert in January of this year and has been romantically linked to Jimmy Iovine for several months.