Although the romance didn't work out for Cox and Arquette, the exes have openly expressed their continued love for each other since their 2010 separation. "He's my best friend in the world," said the Cougar Town star – who has an 8-year-old daughter, Coco, with Arquette – on The Ellen DeGeneres Show. Arquette repaid the compliment, telling PEOPLE: "I love her, too, and she's an amazing person – a beautiful person."