According to TMZ, McLarty is four months pregnant.
The 42-year-old actor has a daughter Coco, 9-year-old, with his ex-wife Courteney Cox, and for the Entertainment Tonight correspondent this will be the first child.
The parents-to-be have been together for two years, with a short break in 2012.
Arquette’s rep hasn’t made any comments yet.
Congratulations to Christina McLarty and David Arquette!