Why did they change Blair's mom in Gossip Girl?

Related questions

1. Is Milo really Dan's baby?
2. Does Lily go to jail in Gossip Girl?
3. Does Nate end up with Vanessa?
4. Is Georgina's baby really Dan's?
5. Who does Lily end up with Gossip Girl?
6. Who played Blake Lively's twin?
7. Who does Nate Archibald end up with?
8. Is Blake Lively a twin?
9. Does Blake Lively play her twin?
10. Did Gossip Girl get Cancelled?

Tags

1. #colin
2. #young
3. #small
4. #screen
5. #margaret
6. #blair
7. #mother
8. #lozano
9. #replaced
10. #because
11. #episode
12. #florencia
13. #reportedly
14. #production
15. #looked
16. #debut