Neil Patrick Harris, Katie Holmes, James Franco, St. Patricks Day

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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

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

A photo posted by Sarah Michelle (@sarahmgellar) on

Happy St. Patrick's Day!

A photo posted by Katie Holmes (@katieholmes212) on

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

A photo posted by Kelly Clarkson (@kellyclarkson) on

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

A photo posted by James Franco (@jamesfrancotv) on

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

A photo posted by Paris Hilton (@parishilton) on

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