Actor Alec Baldwin is set to become a new dad in 2015.

The 30 Rock star's yoga instructor wife Hilaria broke the news to fans on Instagram.com on New Year's Day (01Jan15) by sharing a sweet snap of the couple on a beach at sunset with its 16-month-old daughter, Carmen, touching her mother's growing baby bump.

In the accompanying caption, Hilaria writes, "The sun has set on 2014. 2015 is going to be very exciting as we are thrilled to announce we are expecting another little addition to our family!"

Baldwin shared a link to his wife's post on Twitter.com, alongside the message, "2015 equals Mommy, Daddy, Carmen and a special guest".

The parents-to-be wed in 2012.

The child will be Baldwin's third - he is also father to 19-year-old Ireland, his daughter with ex-wife Kim Basinger.