The 'Charlie's Angels' actress and 'Gravity' singer - who were first romantically linked last August - spent some quality time together at Los Angeles' Sunset Marquis hotel on Monday (18.02.08).
A hotel insider said: "Cameron went into John's room and didn't emerge for about three hours. When she finally came out, she had a massive grin on her face."
John - who has also been linked to 'The Dukes of Hazzard' star Jessica Simpson - recently revealed he is searching for his future wife.
He said: "I think about my wife all the time. I kind of obsess on it. When I find the person I can relate to and who is also a pin-up and who also says 'Can I please take pictures of your ass?' then I am going to get married to her. That I can promise you."
TAGS: Celebrity Cameron Diaz