Some of your favorite actors and musicians appeared to take part in—or at least share their enthusiasm for—the unofficial marijuana holiday on Monday. Here’s a sample: Seth Rogen, actor/director: Happy 420 ya'll. A photo posted by Seth (@sethrogen) on Apr 20, 2015 at 11:18am PDT Miley Cyrus, singer: A photo posted by Miley Cyrus (@mileycyrus) on Apr 20, 2015 at 10:51am PDT 2 Chainz, rapper: On the way to Denver for this 4/20 show with Unc @snoopdogg …in the meantime got a special 4-20 episode of Most Expensivest Shyt out now Che k it out A video posted by 2 Chainz Aka Tity Boi (@hairweavekiller) on Apr 20, 2015 at 11:03am PDT Zach Braff, actor/director: Happy 4/20. A photo posted by Zach Braff (@zachbraff) on Apr 20, 2015 at 11:06am PDT Rihanna, singer: #420 x #hawaii x #badgal A video posted by badgalriri (@badgalriri) on Apr 20, 2015 at 12:12pm PDT Demi Lovato, singer: In honor of our former escapades, I thought you'd like this to remember your first blaze..