'Robsten' as fans called them during their three-year-relationship, reunited at Lily Rose Depp's birthday party, which was held at the Chateau Marmont in Hollywood reports E! News. "They were both serious, but stood together alone behind a car and exchanged a few words," an eyewitness told the outlet.
Kristen was most recently linked to Victoria's Secret model Stella Maxwell, while Pattinson and fiance FKA Twigs split in October 2017.
Robert and Kristen met on the set of Twilight in 2008, and went public with their relationship twelve months later. Their real-life Bella and Edward love story was cut short when photos emerged of Stewart cheating on Pattinson wither her Snow White and the Huntsman director Rupert Sanders.
In 2012 Kristen made a surprisingly public apology, "I'm deeply sorry for the hurt and embarrassment I've caused to those close to me and everyone this has affected. This momentary indiscretion has jeopardised the most important thing in my life, the person I love and respect the most, Rob. I love him. I love him. I'm so sorry."
While Rob told Esquire U.K in 2014, "S--t happens, you know? It's just young people...it's normal! And honestly, who gives a s--t?"
While neither star is yet to comment further on the recent outing, Twi-hards everywhere are hoping a reunion is on the cards...
This article originally appeared on InStyle