Apex domains cannot have CNAME records.
Question and response
Question
dig hiltonprincess.com. NS
Answer
hiltonprincess.com. 5 NS ns.rackspace.com.
hiltonprincess.com. 5 NS ns2.rackspace.com.
hiltonprincess.com. 5 NS ns59.domaincontrol.com.
hiltonprincess.com. 5 NS ns60.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0