Actress Lake Bell has revealed she is expecting her first child with husband Scott Campbell.

The 35-year-old It's Complicated star showed of her burgeoning baby bump at a Tribeca Film Festival Vanity Fair party in New York City on Wednesday night (April 23).

The mum-to-be wore a form-fitting maroon jumpsuit and appeared to confirm the happy news by cradling her belly as she posed for photographers.

The big reveal comes just weeks after Bell posed for an Esquire magazine photoshoot.

Bell and Campbell wed last year in New Orleans, Louisiana.