The singer works the crowd at a concert in Glasgow, Scotland. Plus: Justin Theroux, Jenny McCarthy & more!
Credit: Kristina Bumphrey/Startraks Photo
Published: Friday Feb 21, 2014 | 07:00 PM EST
More from PEOPLE
- Aww! Watch Neil Patrick Harris's Twins Sing 'Jingle Bells'
- Read the Cover Story: Family and Friends Remember Robin Williams
- Watch George Clooney Seduce Elizabeth McGovern on Downton Abbey
- From Gwen Stefani to Jon Hamm: Our Favorite Moments from the PEOPLE Magazine Awards
- Watch Maroon 5, 5SOS Pharrell & Gwen Stefani Perform at the PEOPLE Magazine Awards