Brian Austin Green, Megan Fox

Megan Fox and Brian Austin Green are engaged for the second time, Fox's rep tells TVGuide.com.

Check out photos of Fox through the years

But the Transformers star was so excited when her former fiancé proposed on the beach in Hawaii, she actually lost her two-carat ring in the sand, according to Us Weekly.

"Security and maintenance staff spent a couple of hours looking for it," a source tells the magazine. "No one found it."

Megan Fox not returning for Transformers 3

Fox, 24, and Green, 36 met in 2004 and got engaged in November 2006. The couple called off the engagement in February 2009, saying the decision was mutual.

Do you think the two will make it down the aisle this time around?