New Dancing With the Stars co-host  Erin Andrews has quickly won many fans over with her fun personality and quick wit in the ballroom. But exactly how old is the former Season 10 contestant?

Erin was born on May 4, 1978, which means she's currently 35. And guess what? Her fans were totally on top of this factoid!

When Wetpaint Entertainment teamed up with Viggle LIVE! to test fans' Erin knowledge, and impressive 77 percent of respondees correctly guessed her age. Meanwhile, 17 percent thought she was only 32, and a mere 6 percent thought she was 37.

Want to play along? Download the FREE Viggle App now!

So it seems like fans know a lot about Erin. But are they liking her as a host? When we asked Viggle fans about Erin last week, 68 percent said they thought the new host was doing a good job, though after the show some fans said they found her joke about James Maslow and Peta Metagold having a Dancing With the Stars baby distasteful.

Did you know how old Erin is? Let us know in the comments below!

Want to weigh in with your opinions about all your favorite shows? Download the free app, check in to Viggle LIVE!, and start earning points just for watching and answering questions about your favorite shows!