The 51-year-old 'Striptease' actress recently holidayed with the Dead Sara drummer in Mexico and Jason says their budding romance is getting serious, reported Contactmusic.
"It's going well. They are great and he seems really happy, so it's all good," Jason said.
Moore and Sean, 27, were seen playing in the sea and holding each other while on their Christmas holiday, as she seemed to have finally put her divorce from Ashton Kutcher behind her.