Christina Aguilera and Matthew Rutler
The singer and her fiancé strike a pose.
Miley Cyrus
Wearing a Care Bears Union Suit, Miley took to Twitter and wrote, "Itszzzzz EZ being green! Happy St Pattys."
Mark Hamill
The Star Wars superstar cheers as the annual Saint Patrick's Day parade, the largest in the world, takes place on March 17, 2018 in Dublin, Ireland. Hamill is the the first international guest of the parade.
Robert Downey Jr.
"Embracing green this St. Paddy's Day. #happystpaddysday," he wrote on Instagram.
Rob Kardashian
His daughter Dream Kardashian celebrates the holiday in style!
Jessica Biel
"Hold my Guinness, I just gotta dance. Happy St. Patrick's Day!" she wrote on Instagram.
Jessica Simpson
The singer posted on Instagram these photos of her kids, Maxwell, 7, and Ace, 4, writing, "Happy St. Patrick's Day #MAXIDREW #ACEKNUTE."
Nick Lachey
The singer and TV personality went for the full Leprechaun look.
Pink and Carey Hart
The singer's husband posted this photo of their kids, writing, "One's sick and one's tired. Happy St. paddy's day #GreenBeerMePlease."