Ian Harding, Jessica Alba Encourage Earth Day Engagement In Today's Tweet Dreams

Going green is something lots of our famous faves advocate year round, so we wouldn't expect anything less than extra encouragement from them on Earth Day. Today, environmentally conscience celebs used Twitter as a platform for celebrating and sharing plans for making our world a happier, healthier place. Everyone from "Pretty Little Liars"' Ian Harding (pictured) to Jessica Alba was giddy for Green today. While Ian tweeted a simple "Happy earth day!" reminder, fellow ABC Family star Megan Park took it a step further, encouraging fans to get out, even posting a nature-centric picture of herself doing the same. "Happy Earth Day! Go hug a tree :) http://plixi.com/p/94860427" Jessica Alba tweeted a request for fans' Earth Day plans, encouraging them to tweet back. "Happy Earth Day tweeples! I'd love to know what you all are doing in honor of Earth Day today."

Today was a double holiday for some, and those stars planning trips or family time for the Easter weekend shared their excitement. Hunk Hugh Jackman's tweet (and the attached pic) made us pretty jealous, "Oh what a beautiful morning!!! Happy Easter from Carmel. http://twitpic.com/4o0q48" Hilary Duff shared her Easter plans— volunteer work with big sis Haylie. "Now heading to Los Angeles mission to feed people for Easter and hand out candy baskets to the kidos with @hayliek!!" she tweeted.

Check out the rest of Friday's best tweets, including a CW star run...a fowl? Follow us @hollywoodcrush to get even more celebrity and pop culture news around the clock!

@MattLanter I swear this dancing duck was eyeballin me....punk http://t.co/Rrqx9RI

-Matt Lanter, Actor ("90210")

@therealsavannah #ifitwasuptome music would play in the background during epic moments of my life.

-Savannah Outen, Singer

@SophiaBush Haha! I see many of you encounter this problem here too. 'Your' & 'you're' seems to be the other major snaffu. I find it beyond hilarious.

-Sophia Bush, Actress ("One Tree Hill")

@oliviawilde I'm tweeting from the plane. Does this mean I'm finally a member of that Mile High club?

-Olivia Wilde, Actress ("House")

@ZacharyLevi You'd rather kiss a Wookie? I can arrange that. http://t.co/AO3eBtI

-Zachary Levi, Actor ("Chuck")

@justinbieber solid game of hide and go seek at the hotel...we have the entire floor to our crew...had to do it! #childishgamesareepic

-Justin Bieber, Singer

@breagrant Never thought it made a difference but being blonde makes social interaction much different.

-Brea Grant, Actress ("Heroes")

@katyperry IT'S FRIDAY, FRIDAY GOTTA GET DOWN ON FRIDAY! #goodfrizzle!

-Katy Perry, Singer

@ShawneyJ #FindingNemo is a trend?! This has officially made my life!

-Shawn Johnson, Olympic Gymnast