Celebrity Sean Penn's Girlfriend Is Shannon Costello The actor and producer Shannon Costello began dating this summer By Julie Jordan Julie Jordan Instagram Twitter Julie Jordan is an Editor at Large for PEOPLE. She has been with the brand for 25 years, holding various roles in the Los Angeles Bureau including Associate Bureau Chief. In 2006, she relocated to the Midwest where she continues to cover all things entertainment and Hollywood, including celebrity covers, features and specials such as Sexiest Man Alive and the Beautiful Issue.Prior to joining PEOPLE, Jordan freelanced for magazines such as SOUTHERN LIVING and graduated from the University of Missouri with a Bachelor's degree in Journalism. She is well-versed in what it takes to be the Sexiest Man Alive (having interviewed 11 of them for their cover stories) and considers shooting a confetti cannon on-stage alongside Garth Brooks during his performance of "Friends in Low Places" a career highlight. People Editorial Guidelines Published on August 25, 2011 01:35 PM Share Tweet Pin Email Photo: AKM Images Sean Penn has a new lady in his life and her name is Shannon Costello. The couple took their romance public at the beginning of July and have been spotted together on the beach in Malibu, at Nobu earlier this month, and dining out in Miami. Costello, initially misidentified by the media as Stacey Koplin, is the former communications director of the actor’s J/P Haitian Relief Organization. She and Penn first met in fall 2009 and became friends. Costello began working with J/P in 2010. Costello, 26, also worked on Davis Guggenheim’s documentary Waiting for Superman and has worked at ABC News’ 20/20. Along with Brian Grazer, she will be a producer for Ron Howard’s film, Under The Banner of Heaven, which is in development. Penn will next be seen in the drama This Must Be The Place, which just premiered at Cannes.