Danny DeVito and his "It's Always Sunny in Philadelphia" co-stars Rob McElhenney and Kaitlin Olson will take part in the Greater Philadelphia Film Office's 25th-anniversary celebration Sunday at the Sun Center Studios (63 Concord) in Aston, Delaware County. Cheltenham native Rebecca Creskoff, who co-stars on HBO's "Hung," will also join GPFO Executive Director Sharon Pinkenson and Sun Center's Jeffrey Rotwitt and Adam Rotwitt for the day of events. They end in the announcement of the winners of the 2010 "Shoot in Philadelphia" Screenwriting Awards. All events are free and open to the public. For more info click here. Thursday night, South Philly native McElhenney and Olson, his wife, who delivered the couple's first child, a son, Axel, on Sept. 1, will be at Parx Casino in Bensalem for a Philadelphia Style party. McElhenney was the cover boy of the mag's November issue.