Katie Holmes is not sporting a ring yet, but she is engaged to Tom Cruise.Just one month after the two started canoodling to publicly express their love, Holmes has packed her bags and moved in with the star and pals have said she has accepted his marriage proposal.We also hear that Holmes, a former Christian, is converting to Scientology. A pal says, 'She had her initial meeting at the Scientology center in LA, and she is coverting.'Holmes has also switched agents at Creative Artists Agency--from her longtime rep to Cruise's sister/rep Lee Anne DeVette. Meanwhile, after Tom's over the top...