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The luck of the Irish!

Some of your favorite Hollywood stars are already getting the party started for St. Patrick’s Day on this lovely Tuesday.

The festive holiday is all about rocking green, so Bella Thorne took to Instagram to share a sexy snapshot in her favorite green "Kiss me, I’m Irish" crop top.

Paris Hilton also got in on the fun, posting a series of photos wearing a green sequin top hat with a striped top. 

Neil Patrick Harris celebrated the big day by capturing his adorable twins, Harper and Gideon, decked out in their own green garb. 

"Happy St. Patrick’s Day! Look out for leprechauns!," he captioned the cute candid, which shows his kids wearing giant glasses and hats.

Meanwhile, the Kardashians celebrated St. Patty's day -- and brother Robert Kardashian's 28th birthday -- with tons of throwback pics.

Check out the gallery above to see more holiday selfies, including shots of a green-haired Aubrey O'Day, Emmy Rossum, Raven Symone and more!

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