St. Patrick's Day is upon us, so when you're picking out your green ensemble, here are some dos and don'ts from our celeb friends. Debra Messing, for one, teaches us that you DON'T use green sequins to show off your newly toned armpits.
Victoria Beckham goes for the mod green minidress, which is a DO, but be sure to have the cropped hair, oversized glasses, and permanent scowl to match.
Mickey Rourke shows us that you DON'T want to use St. Patty's Day as an excuse to try bringing back the hypercolor fad. Really, please don't.
Carla Gugino's vivid green gown is a DO, but only on yellow carpets. Red would make this a Christmas look, which is SO three months ago.
DON'T follow in Beyonce's sandy footsteps by wearing a green gown on the beach, unless of course you're an A-list, Grammy award-winning diva. Then do whatever the hell you want.
DO throw in a few different shades of green, and girls everywhere will scream and faint at the sight of you. Worked for Joe Jonas.
Attention, Miley Cyrus and all 16-year-olds under public scrutiny: DON'T use green bathing suit tops to bring attention to your curves. Why not try a more modest use of green … like signing up for Girl Scouts?
Kim Kardashian shows us that you DO want to combine the Irish green with the Greek goddess look.
Take heed from Jennifer Connelly — DON'T use Peter Pan as an inspiration for red carpet fashion.
Take it from Jack Black and DO rock bright green sneakers to add a little flair.
Fergie wears a bright green bathing suit while vacationing in Mexico with hubby Josh Duhamel, which you should only DO if you have a body like Fergie's.
Christine Taylor displays a valuable lesson for us: DON'T wear green when there's Astroturf involved. It looks like a head and limbs floating in midair, unattached to a body.
Rachel Bilson shows you that you DO want to wear some stylin' green shades on St. Patty's Day. Though a smile would help add a little "fun" to this look. Lighten up, Rach.
When you're wearing a shimmery green designer dress like Lindsay Lohan, DON'T get into a water fight with your girlfriend. Though it's probably the most harmless fight those two have ever gotten into.
Katie Holmes looks adorable in this green knit cap … definitely a DO if you wake up with a St. Patty's bad hair day.
DON'T travel in a kelly green tracksuit, like the always-demure Paris Hilton here. You'll really get lost in the crowd.
DO wear a Army green peacoat, especially if you're trying super hard to be edgy and punk rock like Jared Leto.
If Shanna Moakler can't pull off a green potato sack, DON'T even try it … even if there are flower appliques attached.
DO follow Zac Efron's lead by rocking the too-cool green hoodie, sunglasses, and ski cap look. It's perfect for the casual dreamboat everyman.
DON'T throw on a bright green scarf while also donning a bright blue jacket like Kevin Kline. It's a sensory overload.
Paula Abdul proves that you certainly DON'T want to fit into a green dress that's two sizes too small by tying it off with some rope.
Redheads everywhere DO need to step it up a notch like Marcia Cross and wear emerald green satin for the occasion.
Heidi Klum rocks some torn-up pastel green pants, showing the world a valuable lesson: pastels and grunge DON'T mix.