Lena Dunham And Alison Williams Make Out For A Good Cause

Here @aw and I are taking the #TwizzlerChallenge ❤️pass it on! twizzlerchallengeforautism.org #NightofTooManyStars #NYC4a

A video posted by Lena Dunham (@lenadunham) on Mar 18, 2015 at 9:28am PDT

Lena Dunham and Alison Williams are kissin' for a cause!

The Girls co-stars locked lips to promote a new viral campaign, the Twizzler Challenge, benefiting an autism charity, New York Collaborates for Autism. Looks like we have the new Ice Bucket Challenge!

In the vid, Dunham says, "We are here to take the Twizzler Challenge for autism in honor of our dear friend Natasha." Williams chimes in, "New York Collaborates for Autism, we love you."

In an additional video, the stars nominated some others to get their Twizzler Challenge on. Dunham wrote, "Here is who (Alison) & I challenge to the twizzler challenge! @ktqlowes & @guillermodiazreal, @ilanusglazer & @abbijacobson AND Rita Wilson & Larry David. Go! #NYC4a #TwizzlerChallenge"

She'll take it all off for her art, so we aren't surprised to see that the Girls creator will smooch a chick for charity.