Joe Otterson TV ReporterReba McEntire is boarding “Big Sky” Season 3 at ABC in a series regular role.The news comes just days after the third season renewal announcement for the drama series, at which time it was also announced that both Jensen Ackles and Jamie Lynn-Sigler are also going to appear as series regulars in the new season.McEntire will play Sunny Brick, described as the mercurial matriarch of the Brick Family, a successful backcountry outfitter with a secret history of missing customers.McEntire is an incredibly accomplished musician, winning numerous top industry awards with 35 chart-topping singles and over 56 million albums sold worldwide. But she is also an accomplished actress.