Actors Dax Shepard and Kristen Bell arrive at the 70th Annual Golden Globe Awards held at The Beverly Hilton Hotel on January 13, 2013 in Beverly Hills, California. Credit: Jeff Vespa/

There's no turning back now! Though future spouses Kristen Bell and Dax Shepard will welcome their first child together this spring, the Hit and Run costars don't feel 100 percent ready for the responsibility that comes with raising a baby.

"We're giving the child up for adoption," Shepard, 38, joked when Entertainment Tonight asked "what kind of crazy parents" they will be.

Without missing a beat, Bell deadpanned, "If anybody wants it, let us know!"

The wisecracking duo has been engaged since 2007. Though the stars know their child's gender, the When in Rome actors won't be sharing it publicly until Bell, 32, gives birth.

According to Shepard, however, that announcement may be further off than people think. "She's having an elephant," he joked of Bell. "They gestate many months longer than a human."

All kidding aside, House of Lies' Bell -- who dressed her baby bump in a lilac Jenny Packham gown at the 70th Annual Golden Globe Awards in Beverly Hills -- said she's had an easy pregnancy so far: "I feel great!"