Hollywood Honors World AIDS Day & A '90210' Hottie Joins Twitter In Today's Tweet Dreams

As the world acknowledges World AIDS Day, celebs took to their Twitter pages to spread the word about the importance of today's efforts.

"America's Next Top Model" star Jay Manuel explained to followers how to join in the online support campaign, "It's WORLD AIDS DAY. Show your support for @joinred. Use #RED & turn tweets red." Ashton Kutcher posted a startling statistic to get fellow tweeters to help, "WORLD AIDS DAY - 10% of world population is in Africa. 67% of all HIV cases are there. Get involved. #red." Ciara encouraged fans to take part in helping stop the global epidemic, "2day is WorldAidsDay & I would like 2 encourage everyone 2 do everything to protect themselves! Know your partner and get tested b4 getting involved! Once you start to get involved, dont stop getting tested! Make the tests mandatory! love Ciara!"

Today not only marks World AIDS Day, but, of course, the start of December and Hollywood had some ideas on what else you can do to ring in the new month. "My Big Fat Greek Wedding" actress Nia Vardalos suggested, "It's December..could someone please invent candy cane cereal..." Or you could always kick things off by following Twitter newbie (and "90210" hottie) Matt Lanter (pictured). His fellow CW cohort, "Vampire Diaries" star Nina Dobrev has already welcomed him to the Twitterverse with open arms, "hey buddy welcome to the twitter world :)" Hey, Matt, just so you know, we here at Hollywood Crush are pretty darn happy to have you, too!

Keep reading for the rest of today's best tweets, including Jason Mraz's time travel wish and Alyson Hannigan's lovely lunch with Tim Gunn! Don't forget to follow us on Twitter @hollywoodcrush to get the latest news on all your favorites in the world of entertainment.

@tinselkorey I love people who pretend to be me on the internet. It's amusing. BUHAHAHAHAHA!

-Tinsel Korey, Actress ("New Moon," "Eclipse")

@jason_mraz I'd like to acknowledge the boy I was 15 years ago and give him a high five. I'm so glad he went for it. There's no place I'd rather be.

-Jason Mraz, Musician

@alydenisof A pinch myself moment yesterday was talking about Martha Stewart with Tim Gunn at lunch. Oh the joy!!

-Alyson Hannigan, Actress ("How I Met Your Mother")

@michaelianblack Starting to feel bad for lunch and dinner: you guys are also important meals.

-Michael Ian Black, Comedian, Actor ("Michael and Michael Have Issues")

@azizansari Next time I'm at Trader Joe's, I'm just gonna eat 10-15 samples just to see what happens. Stay tuned...

-Aziz Ansari, Comedian, Actor ("Parks and Recreation")

@diablocody It's an achievement to get your clothes to smell like cat litter when you don't have any cats.

-Diablo Cody, Screenwriter ("Jennifer's Body," "Juno")

@busyphilipps25 Just got paparazzi'd at starbucks &when I said,"noone's gonna want these" the photog kindof sighed and said,"I know." offically made my day.

-Busy Phillips, Actress ("Cougar Town")

@brookeburke Just finished a killer work out. At Starbucks.

-Brooke Burke, Reality Star ("Dancing with the Stars")

@adrienne_bailon Jay Z makes miracles happen on the treadmill!

-Adrienne Bailon, Singer, Actress ("The Cheetah Girls")

@shannamoakler I dont want to go to the gym, I don't want to go to the gym, I don't want to go to the gym... I'm going to the gym.

-Shanna Moakler, Reality Star ("Meet the Barkers")