Megan Fox and Brian Austin Green in engagement

After being rightfully dropped from the cast of Transformers 3, Megan Fox has found something novel to do with all that free time – She got engaged to ex-boyfriend, and ex-fiancee Brian Austin Green – again.

The pair were staying at the Four Seasons Hualalai hotel on the Big Island in Hawaii on June 1st, when Brian popped the question amid all that glorious sand.

“I saw her jumping up and down,” a witness tells Us. “Later, I saw half-a-dozen staff sifting through the sand.”

Megan now claims she ‘lost’ the 2-carat diamond ring due to all the excitement.

“Security and maintenance staff spent a couple of hours looking for it. No one found it,” we’re told.

Ask yourself, girls – would you lose a 2-carat rock? Remember, this is the same actress who recently admitted she’s spoon-fed other lies to the press.

“In the past, I’ve been reluctant to share any truth about myself,” the 24-year old starlet told Us. “I have sort of aided the media in printing these misconceptions, which I regret.”

So she lied for publicity. Now she’s admitting she lied – which scores more publicity, with no work required. Sad, isn’t it.

But she also claims that this time, she and Brian are for real:

“I’ve been in this relationship for so long and I love him so much, and of course marriage is in the future somewhere,” she told reporters at the “Jonah Hex” junket on Sunday. “I’m not closed to that idea.”

This is the second time the couple have attempted an engagement. Brian, 36, and his rather careless companion started dating in 2004 and got engaged in 2006. But that flamed out last February.

We’ll keep you advised if they get near an altar this time. Meanwhile, expect news of the ring’s miraculous ‘discovery.’