Antonio Banderas and Salma Hayek attend the premiere of 'Puss In Boots 3D' at the Entertainment Quarter Sydney, Australia, Nov. 27, 2011. (Robert Wallace/WENN.COM)

Antonio Banderas and Salma Hayek grew to hate each other as they travelled the world promoting Puss in Boots.

The couple conducted 739 interviews in 11 days when the film came out last year (11), and movie bosses gave them diplomas for enduring the promotional commitments patiently - but inside both Banderas and Hayek were ready to "kill each other".

Banderas reveals, "We travelled to nine countries, nine premieres, three different continents... It was fun and difficult too. It's just weird when you're doing interviews. Basically, they (reporters and interviewers) ask you the same question again and again... and you answer the same thing... and when you're doing pair interviews - because Salma and I we were just doing interviews all the time together - it's just weird.

"By the time that we were in Rome, we started kind of hating each other. By the time we were in Sydney, we wanted to kill each other - because we knew exactly what the other (person) was going to answer (sic). We were just so tired.

"I remember that question they were making to Salma (sic), 'So your daughter saw the movie?' And she said always, 'Oh yeah, I took her to the movie theatre and she suddenly said, 'Oh mommy, that cat sounds just like you' again and again and you have to be kind of nice about it... and sometimes (when I answered questions) I was looking at her (Hayek) and she was just lip syncing me exactly."

But the movie star insists the pair is the best of friends again now the press tour is over: "I love her, she's great."