The 46-year-old actress who is married to Ashton Kutcher uploaded candid images taken during her visit to a Hollywood dentist to her Twitter account. The pictures show the make-up free star grinning at the camera missing a front tooth.
Demi later joked about the unflattering images on her Twitter account, writing: "Happy to share and always appreciate the opportunity to find humility!!! Or at least be able to laugh at myself!"
Meanwhile Ashton, 31, has thrown a party to celebrate becoming the first person to have one million people following his updates, or "tweets”. He and Demi – who are both active users of the micro-blogging website -celebrated the milestone with a party broadcast live on video-sharing website YouTube yesterday.
Thousands of fans tuned in to watch the couple drink champagne and dance to Kool and the Gang's hit 'Celebration'.
Ashton later posted an update reading: "Victory is ours!"
To thank his fans for signing up to his account, the actor has promised to donate 10,000 mosquito nets to charity in support of World Malaria Day.