We all know celebs build up enthusiastic fanbases, but some stars really go the extra mile for their supporters ... and we wanna see if you can guess who this fan-loving performer is!

We ran into this actress all the way back in 2014 when she was signing autographs and taking selfies with a few enthusiastic admirers ... which is all in a day's work for someone like her!

Still, we're not sure if her fans would recognize her these days ... because she shaved her head for the new "Bugonia" sci-fi flick!