According to his 31-year-old girlfriend Emilie Livingston's Twitter page, the "Jurassic Park" star proposed last week in Hawaii.
The actor -- who was spotted with Emilie in the tropical paradise last week (above) -- apparently made the trip extra special by popping the question, and Livingston couldn't help but tweet her excitement about the big day.
"Jul 8 he proposed @ our fave #okstore. I was taken over by tears of joy n ecstasy! We picked the ring 2gether #inlove," Emilie posted on Saturday.
"Celebrating our engagement! #haleakala #sunrise #jeffgoldblum #emilielivingston #soulmates #initforlife #love," she also shared with a picture of her sparkler.
We've reached out to Jeff's rep for an additional comment, but haven't heard back.
Hopefully, the third time is the charm for "The Grand Budapest Hotel" star -- the actor was previously married to Geena Davis from 1987-1990 and Patricia Gaul from 1980-1996.
What do you think about Emilie's ring? Tell toofab in the comment section below and check out the galleries above to see more celebrity engagement rings and beach bods!