Check Out Which Celebrities Are On Pinterest

If you haven't heard of Pinterest, you're missing out.

The site, which brands itself as "a pinboard for the things you love" is highly addicting—so addicting it's gaining the attention of everyone from college students to Hollywood's A-listers.

The site allows you to virtually pin anything of interest to pinboards through photos. Since its debut in 2010, Pinterest boasts 17.8 million users.   

So far, Barack Obama and Demi Moore are among the 16 known celebrities pinning it up.  

Among the best boards include Seacrest's "Not Your Mom's Grilled Cheese" and Mark Zuckerberg's iPhone"Home Screens."

There are some pretty vain ones too: "What Ryan's Wearing" and self-promoter Alanis Morrisette who pins her articles, music videos and a list entitled, "Alanis Recommends." (We don't think she really gets it.)

Ryan Seacrest

Seacrest has some of the most interesting boards including his and her gift ideas, red carpet show stoppers and varieties on the original grilled cheese. 

http://pinterest.com/ryanseacrest/

Ellen DeGeneres

Lead funny woman's page is filled with boards entitled "Clumsy Thumbsy" (featuring iPhone autocorrect fails) "Bad Paid-for Photos." Naturally, there's a board set aside for Nicki Minaj-rapping Sophia Grace. We're waiting for some pins on the "Ellen Dolls" board. 

http://pinterest.com/ellentv/

Alanis Morissette

The '90s singer's page is filled with a lot of self-promotion. She oughta know that's against pin etiquette 101. 

http://pinterest.com/morissette/