Like many others, Demi Lovato was also nursing a mother of a headache on the first day of 2016. However, alcohol wasn't the reason behind it.
The 23-year-old singer, who has battled substance abuse in the past, performed at the Dick Clark's New Year's Rockin Eve with Ryan Seacrest concert in Times Square in New York City in front of about one million people, reports E! Online.
Next day Lovato tweeted, "I have the worst headache this morning and I didn't even drink last night. God bless those hungover today.. May the hydration be with you.