Seth Rogen kept his fiancée Lauren Miller close as they hit the red carpet at tonight's premiere of The Green Hornet in LA. Cameron Diaz looked sexy and tan in a tight red dress at the screening, but Lauren had her own eye-catching accessory on her left hand. Her diamond engagement ring stood out against her pink number as she posed with her real-life leading man. Seth popped the question in September and shared his embarrassing nudity-filled proposal story on Conan a few months back. He has a long week of promotional duties ahead of The Green Hornet's release on Friday, and luckily he has his proud partner by his side for his big night.

Cameron Diaz returned from her Hawaiian vacation with Alex Rodriguez just in time for tonight's premiere of The Green Hornet in LA. She showed off her toned arms and glowing skin in a sexy red Azzaro dress and nude pumps. Cameron's been juggling bikini time and promotional duties for the movie since last month when she stopped in Miami and Mexico between traveling the world with her costars Seth Rogen and Christoph Waltz. Seth brought his fiancée Lauren Miller to the event, where she debuted her gorgeous diamond engagement ring. Cameron is also set to make a stop by Jimmy Kimmel Live tonight to talk up the film ahead of its release this Friday.

Sandra Bullock and her son, Louis, returned to their NYC home after running errands around the city today. They've been braving the snow on the East Coast, where Sandra's prepping for work on her new project, Extremely Loud and Incredibly Close. Sandra's focus may be on business, but rumors about a budding relationship between her and Ryan Reynolds continue to make headlines, which has apparently upset Ryan's ex Scarlett Johansson.

Rachel Griffiths took a break from her motherly role on Brothers & Sisters to join her real-life kids Banjo and Adelaide at a friend's birthday party in a Santa Monica park yesterday. Her youngest child, Clementine, didn't join the group for the bash, where Rachel also mingled with pals. She's on a break from filming her aging TV show, and she might get even more time off if the series doesn't get picked up for another season.