Credit: Jason LaVeris/FilmMagic

Emily Deschanel has a new role to tackle: motherhood!

The Bones actress, 34, is expecting her first child with husband David Hornsby, her rep confirms to

Deschanel and writer-actor Hornsby -- who plays Matthew "Rickety Cricket" Mara on FX's It's Always Sunny in Philadelphia -- began dating in 2007. The couple tied the knot in a private L.A. ceremony on September 25, 2010.