Rachael Leigh Cook is seeking to receive a joint custody agreement over the children she shares with estranged husband Daniel Gillies.The She’s All That actress, 40, filed her request with a Los Angeles County judge on July 17, according to new legal documents obtained by Us Weekly. The filing did not specify whether Cook or the Originals alum, 44, would be required to cover the costs of child support.Cook wed the Vampire Diaries alum in August 2004.