Preston died at the age of 57 after battling breast cancer for two years. Hollywood has taken to social media to mourn the loss of Kelly Preston ... son in "The Cat in the Hat." ...

Celebrities are paying tribute to actress Kelly Preston ... Spencer Breslin, who starred with Preston in 2003's "The Cat in the Hat," tweeted: "RIP to my on screen mom, #kellypreston.

Kelly Preston plays Joan Walden in the film. Joan is Conrad and Sally's mother. She is a single mother and a workaholic real estate agent who works for Hank Humberfloob. The Cat in the Hat is ...