He famously dumped her to shack up with Angelina Jolie.
And it seems all is not forgiven going by Laura Dern's expression as ex Billy Bob Thornton squeezed past her to accept his award at the Golden Globes in Beverly Hills on Sunday.
Social media erupted following the awkward incident, which occurred after he won the best actor in a television series gong for his Amazon show Goliath, in which he plays an alcoholic lawyer who fights for the little guy.
Unlike the 61-year-old's jolly demanour on stage moments later, Billy bob looked distinctly stony faced as he forced his way past his former fiancee on his way to picking up his prestigious paperweight.
A fan watching the episode on Twitter mused: 'At least we got to see Laura Dern physically fight the urge to stab Billy Bob as he walked behind her.
Another said: 'I'm convinced Billy Bob Thornton walked past Laura Dern just to piss her off.'
One wit injected levity into the moment, saying, 'Why wasn't Brad Pitt,Billy Bob Thornton,Laura Dern, Vince Vaughn & Justin Theroux seated at the same table? #MissedOpportunity.'