|Bradley Cooper and Zoe Saldana|
The couple - who dated for three months after meeting on the set - have managed to avoid each other at previous screenings for the film, but posed for pictures together after walking the line of journalists separately.
They got together after 'Star Trek' beauty Zoe broke up with her partner of 11 years Keith Britton in November last year.
By March the romance was over, although friends say they were never serious about each other.
A source said: "They're definitely not together. She and Bradley weren't super serious at all."
The pair are not the only stars to have to reunite on the red carpet after splitting - it is thought Robert Pattinson and Kristen Stewart will be seen together to promote the last film in the 'Twilight' franchise, despite her cheating on him with 'Snow White and the Huntsman' director Rupert Sanders.
MTV Video Music Awards host Kevin Hart said: "From what I understand they're both still gonna be here. I'm not really up to speed on the whole soap opera that's been going on between them. I know they've got a movie to promote. Twilight's coming out so it makes sense for them to show up at the VMAs if you ask me.
[Although] I don't really care."