Bennifer reunited! Ben Affleck 'whispered in ex Jennifer Lopez's ear and she slapped his arm during flirty reunion at Oscars'

Hey called off their engagement over a decade ago.

But on Sunday night Jennifer Lopez and Ben Affleck were acting like an old married couple when they had a behind-the-scenes reunion at the 87th Academy Awards in Hollywood, according to the Associated Press.

The 42-year-old actor 'whispered in her ear' and then the 45-year-old Boy Next Door star playfully 'swatted his arm,' a source said.

 J-Lo interestingly did not bring her rumoured beau Casper Smart (who she traveled to India with in early February for a private concert).

And the Gone Girl star did not appear to bring his wife Jennifer Garner with whom he has three children.

Both Lopez and Affleck served as presenters at the awards show which saw Birdman win Best Picture, Julianne Moore take home the statuette for Best Actress and Eddie Redmayne pick up the Oscar for Best Actor.