It's Always Sunny in Philadelphia ASTROLOGY, Cast, and characters, by #celebrastrology

McElhenney, Howerton, Day, Olson, and DeVito at the 2013 San Diego Comic-Con.

Rob McElhenney as Ronald "Mac" McDonald – Mac

Robert Dale "Rob" McElhenney

Aries

 (/ˈmækɨl.hɛni/;^[1] born April 14, 1977) 
Glenn Howerton as Dennis Reynolds – Dennis

Glenn Franklin Howerton III 

Aries

(born April 13, 1976)
Charlie Day as Charlie Kelly – Charlie 

Charles Peckham "Charlie" Day 

Aquarius

(born February 9, 1976)
Kaitlin Olson as Deandra "Sweet Dee" Reynolds – 

Sweet Dee 

Kaitlin Willow Olson 

Leo(born August 18, 1975)

Danny DeVito as Frank Reynolds (Season 2–present) – 

Frank

Daniel Michael "Danny" DeVito, Jr.

Scorpio

(born November 17, 1944)