Leelee Sobieski and Adam Kimmel
Vince Flores/Celebrity Photo; Patrick McMullan/Sipa
07/17/2009 AT 06:25 PM EDT
Leelee Sobieski is engaged to fashion designer Adam Kimmel, her rep confirms to PEOPLE.
The 27-year-old Joan of Arc actress was spotted wearing a sparkler on her ring finger at the Public Enemies premiere in L.A. in June.
No other details about the engagement were released.
Sobieski, who recently wrapped up production on the drama The Mad Cow, has modeled for her fiancé's Fall/Winter 2009 look book.
Reporting by LISA INGRASSIA