Who Made Demi Lovato Starstruck?

Having worked with celebs like the Jonas Brothers and fellow X Factor judges Simon Cowell and Britney Spears, you would think Demi Lovato would be cool as a cucumber around other celebrities. After all, the 20-year-old entertainer seems to remain calm and collected in photos with them! So who did Demi openly fan-girl over this past weekend – was it a celeb crush?!

No, Demi was way excited to meet President Obama and First Lady Michelle Obama! On Dec. 9th, Demi took part in “Christmas in Washington,” the annual concert that benefits the Children’s National Medical Center.  

She tweeted:

How adorable – it’s nice to know that even celebs get starstruck too!

The Christmas in Washington concert airs Dec. 21st on TNT. 

Which one celeb would you get the most starstruck around?