'Duck Dynasty' Season 4 Premiere: Cast Welcomes 3 New Family Members Al, Christine, and Lisa Robertson / Air Date August 14 at 10 PM ET on A&E [TRAILER]

The season 4 premiere of Duck Dynasty will air tonight on A&E and viewers can expect to see three new faces from the Robertson clan. The Duck Dynasty cast has expanded to include Al, Christine, and Lisa Robertson, who will join Si, Jase, Missy, Korie, Willie, Phil and Kay on the show. Al Robertson is a preacher and is the only male member of the family who lacks a beard. He is joining the cast to "spread the word of God to a larger audience." Alan will take over the Duck Commander family business as their public relations agent. Duck Commander CEO Willie Robertson refers to Al as the "black sheep of the family."

The excitement has been building for the season 4 premiere of Duck Dynasty ever since the finale of season 3 on April 24, 2013. The season 3 finale was the most watched and highest rated telecast in A&E history.

One of the most anticipated stories from season 4 will include a formal wedding between Phil and Kay put on by Willie and Korie as an anniversary present for the already married couple. "There are some things you only want to do once, and helping Korie plan a wedding is one of them. Trust me," Willie says. The clip from the season 4 premiere shows Phil trying to decide on best man for his wedding.

Tune in tonight at 10 pm EST on A&E to watch the Duck Dynasty cast in action in the season 4 premiere!