Shia LaBeouf’s girlfriend Mia Goth has sparked rumors suggesting the stars are preparing to wed after she was photographed wearing what appeared to be an engagement ring on Monday.

The 21-year-old actress debuted the large diamond on her left ring finger at Los Angeles International Airport.

Representatives for both LaBeouf, 28, and Goth had yet to respond to requests for a comment.

The pair began dating in 2012 after meeting on the set of controversial Lars von Triers sex thriller Nymphomaniac.

LaBeouf has a history of romancing his co-stars – he previously dated his Wall Street: Money Never Sleeps colleague Carey Mulligan and has been linked to Isabel Lucas and Megan Fox, who both worked with the actor on the Transformers films.

J-Connection: Shia LaBeouf is a Jewish actor.