USA has bought into a 12-episode fourth season of “Chrisley Knows Best,” the reality series that focuses on Georgia-based millionaire Todd Chrisley and his family.

Described as a real-life family comedy, the series saw a ratings high when it returned for season three in June. It now ranks in the top 10 of unscripted cable series in all key demos and total viewers.

“The Chrisleys continue to be on a roll, as fans can’t get enough of the family’s amusing, unfiltered and relatable moments,” said Chris McCumber, USA Network prexy. “We’re pleased to bring fans a fourth season of ‘Chrisley Knows Best,’ a show that keeps growing its audience, resonates with viewers and always has us guessing what’s next for Todd and his family.”

“Chrisley” is produced by Maverick TV and All3Media America. Adam Greener, Stephanie Bloch Chambers, Marilyn Wilson, Jen Perry Leamy, Jim Sayer, Eli Holzman and Stephen Lambert serve as executive producers. Annie Kate Pons serves as supervising producer.

“Chrisley” airs at 9 p.m. Tuesdays on USA. A mid-season finale scheduled is for July 21. The network is also about to start production on two Chrisley pilots: a nighttime talk show hosted by Todd Chrisley from Embassy Row (“Watch What Happens Live,” “Talking Dead”) and a spinoff pilot with series partner Maverick TV.