Sandra Day O'Connor was only in an honorary legal fraternity/sorority but her mom was a Gamma Phi Beta.
Delta Burke pledged Zeta but was never initiated.
Candice Bergen was a Kappa but voluntarily deactivated partly due to too many demands for appearances etc from other Kappas (and that was told to me in mid-1908s by Kappa HQ!)
One source I use to check bios of some stars etc is the Internet Movie Data Base -- go to:
www.imdb.com
(I can't seem to insert the site!)
Urban Greek legends I have seen on some Gamma Phi websites are that Kirstie Alley and Elizabeth Montgomery (Bewitched) were Gamma Phis -- neither were.
One actual fact that I used to think was myth til I called DZ HQtrs myself to ask was that Crown Princess Margaret of Norway was a DZ!