Ashton and his wife, Mila Kunis, were both invited to attend Adele’s birthday party. Adele chose a very interesting (and unconventional) theme. It was a 1970s New Year’s [Eve] theme.!
After Ashton pulled his outfit together, he realized he had to commit to the theme one hundred percent—down to the facial hair. So he shaved his beard off and left a very 1970's mustache!
Watch Ashton tell Jimmy Fallon all about it below: