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Ashley Greene and singer Joe Jonas Image Credit: Rex Features

Ashley Greene and singer Joe Jonas were almost arrested at an airport in Abu Dhabi after the latter accidentally left a set of knives in his carry-on luggage.

The couple were halted by security after the 21-year-old Camp Rock star accidentally put some newly-bought cheese knives into his carry-on bag, reports femalefirst.co.uk.

"We were going from the Middle East to New York, so there was tons of security, tons of screenings. We got through one, surprisingly enough. The second one we got to and they stopped and looked at us with these really stern faces," said Green.

"They were like, ‘What's in your bag?' I look at Joe and there are these flashbacks of this knife set we got. They were cheese cutting knives. I look at Joe and I'm like, ‘Did you leave the knives in the bag?' He's like, ‘Whoopsies.'

"Whoopsies doesn't cut it. We were going to get arrested," she added.

After explaining their mistake, the couple were allowed to stow their knives in the plane's main baggage area.

"It was embarrassing," she said.

It is the first time Greene, 23, has confirmed she is dating Jonas.

"I have been in Peru, I was in Columbia, Argentina, Chile and then we just got back from Abu Dhabi. I was there for pleasure — my boyfriend was on tour and I had some time off so I went out to support him. He's really sweet," she said.