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, reported Daily Mail.
Posing together for pictures on the red-carpet, at one point Cooper, 37, was seen looking up into the air, while his Saldana, 34, appeared to have her teeth clenched.
"They're definitely not together. She and Bradley weren't super serious at all," a source said.
The pair got together after "Star Trek" beauty broke up with her partner of 11 years Keith Britton in November last year.