Neil Patrick Harris, Katie Holmes, James Franco and More Stars Celebrate St. Patrick's Day!

See celebs' Twitter and Instagram posts

Happy St. Patrick's Day!

Celebs like Neil Patrick Harris, Katie Holmes, James Franco and more are taking to Twitter and Instagram today to celebrate the luck of the Irish.

"Happy St. Patrick's Day! Look out for leprechauns!" NPH shared this morning with an adorable photo of his twins Harper and Gideon all dressed in green. Meanwhile, Sarah Michelle Gellar shared a hilarious sexy photo of herself in St. Patrick's Day-inspired clothes with the caption, "Is there a such a thing as #FlashbackTuesday? #HappyStPatricksDay."

Read on for more spirited celebrations from Ellen DeGeneres, President Barack Obama, Zoe Saldana and more!

Happy St. Patrick's Day! Look out for leprechauns!

A photo posted by Neil Patrick Harris (@instagranph) on Mar 17, 2015 at 9:17am PDT

Is there a such a thing as #FlashbackTuesday? #HappyStPatricksDay

A photo posted by Sarah Michelle (@sarahmgellar) on Mar 17, 2015 at 7:05am PDT

Happy St. Patrick's Day!

A photo posted by Katie Holmes (@katieholmes212) on Mar 17, 2015 at 9:27am PDT

Happy St. Patty's Day from this little cutie :)

A photo posted by Kelly Clarkson (@kellyclarkson) on Mar 17, 2015 at 3:34pm PDT

??Happy St. Pats!?? ??Get Frisky!??

A photo posted by James Franco (@jamesfrancotv) on Mar 17, 2015 at 9:16am PDT

St. Patrick's Day is an enchanted time - a day to begin transforming winter's dreams into summer's magic. ~Adrienne Cook

? Zoe Saldana (@zoesaldana) March 17, 2015

Happy St. Patrick?s Day! I celebrated by playing a pipe to all the snakes in our yard. Kenny G was their favorite.

? Ellen DeGeneres (@TheEllenShow) March 17, 2015

Happy St.Patricks Day!!!???????????????????????????? My dog Lampo,in the hood on his way to #Farrell's for a Jamison:) Pic by @waggintailsbklyn #goodluck

A photo posted by Debi Mazar (@debimazar) on Mar 17, 2015 at 1:16pm PDT

Happy St. Patrick's Day everybody! Who's wearing green and who got pinched? ;) xoP

? The Real Paula Abdul (@PaulaAbdul) March 17, 2015

Happy Saint Patrick's Day. pic.twitter.com/i2hxSFrYGB

? Barack Obama (@BarackObama) March 17, 2015

#HappyStPatricksDay ?? while everyone is drinking their beers(yum)..I'm laying in bed with my daughter for nap time. ??

? Nicole Polizzi (@snooki) March 17, 2015

Happy St. Patrick's Day everyone! ??????

A photo posted by Paris Hilton (@parishilton) on Mar 17, 2015 at 11:56am PDT

Guess my green shirt brought me luck after all. Just won the final hand with pocket aces! A #HappyStPatricksDay indeed! #LuckOfTheIrish #ThatJustHappened

A photo posted by Kellan Lutz (@kellanlutz) on Mar 17, 2015 at 3:30pm PDT