Gisele Bundchen rallies the support of Ian Somerhalder for her latest environmental activity. Hey there, I'm Karli Bulnes. Find out what the supermodel and heartthrob are up to in today's PopSugar Rush. "It's a global showdown, so have some fun, create a buzz, mobilize millions, and join me for the World Environment Day challenge now." The famously green Gisele Bundchen is gearing up for this year's World Environment Day, and the supermodel is getting even more celebrity support this year in the form of Vampire Diareis star Ian Somerhalder who's following in her activist footsteps! "Hi, I'm Ian Somerhalder, soon to be UN goodwill ambassador for the environment." Both environmentally-minded stars are challenging fans to pledge green activities such as taking the bus or cutting back on their water use during the first week of June, with winners being announced in July. Last year, Gisele and actor Don Cheadle went head to head to see who could get the most fan support for the same cause and Ian had a hard time taking sides. "I couldn't decide between team Don or team Gisele, actor extraordinaire or supermodel activist, um, no way." Ms. Bundchen beat Don, so she sent this sweet message to him this year since they've now joined forces and are working with Ian and other actors who share their passion. "Sorry Mr. Cheadle, sorry bout that, I love you though." Be sure to celebrate World Environment Day on June 5th, and if you want to register an action to support Gisele and Ian, visit unep.org.