Caldwell's rep confirmed the breakup: "The couple remain good friends and being very private people, appreciate their privacy at this time."
The rep confirmed the split after Star Magazine reported that Caldwell was seen making out with another guy shortly after Cook was spotted checking out a $54,000 engagement ring.
Cook and Caldwell have been dating since May 2008.
What the Editorial:
Darn, I had just picked out the dress I was going to wear to the wedding.
Perhaps David should concentrate on his career anyway.