Let's hope his real-life wedding goes more smoothly than his big-screen one.

Actor Justin Bartha is engaged to fitness trainer Lia Smith, according to Us Weekly.

The 34-year-old star of The Hangover and the recently canceled The New Normal apparently popped the question earlier this month while the two were on vacation in Big Sur.

For a pic of the two of them together, click here!

"They're the cutest couple," a source says. "She was completely surprised by the whole thing."

"The trip to Big Sur, the engagement, the ring, everything — so cute," the insider gushes.

The source adds that the engagement ring is "just unbelievable."

"They are an amazing couple and so gorgeous together," the clearly smitten source goes on.

Justin and Lia met during a Pilates class at the gym in L.A. where she works as an instructor.

They just recently went public as a couple earlier this year when they were spotted on a beach in Maui together over New Year's.

It will be Justin's first marriage. He had previously dated Ashley Olsen for two years until they split in March 2011.

We're happy for Justin, especially since we can assume it was tough for him (as it was for us) to find out that The New Normal  created by Glee svengali Ryan Murphy  had been canceled by NBC last week.

But this is still a big month for the star, as his highly anticipated film, The Hangover Part III, hits theaters next week.

Congrats to these two! And let's hope his bachelor party doesn't involve any tigers.

Source: Us Weekly