Guess who turned up at Weedmaps' Museum of Weed opening the other night? Your favorite smokers and tokers! Ashlee Simpson and hubby Evan Ross, Vanessa Hudgens (who knew?!) and Ireland Baldwin, among others.

A weed museum, you might ask? Here's what it is, according to the web site: "More than just history, and more than stonerisms – the museum exists to celebrate how culture and cannabis shaped each other. This 30,000 sqft experience features seven immersive exhibits, a Plant Lab, interactive art installations, artifacts and more. Be sure to check out the gift shop and grab some munchies from the cafe."

And, "The Weedmaps Museum of Weed takes visitors through the storied history of cannabis by moving through the many varied locations and time periods where it has typically -or stereotypically- been consumed. Here, we celebrate the victories and shed light on the most damning moments throughout the last century."

Sorry, youngin's -- you've gotta be 18 or older to attend. There are trippy interactive exhibits that are HIGHLY Instagrammable ... and in general, many, many celebrations of the herb. Here's who Ireland explained her experience at the museum: "Thank you @weedmaps for having me to the opening of the #museumofweed last night! Such a cool and informative experience. If you’re in the LA area or are planning a visit, this is a must. Thank you for also shedding light on the social injustices surrounding cannabis. Let’s keep fighting 🥊💚 #ad #museumofweed."

Ummm ... family fun?!