Credit: Vivien Killilea/; Jon Furniss/

It's a good thing Demi Lovato pumped the brakes when she did!

The "Give Your Heart a Break" singer, 19, almost caused an unfortunate accident Monday afternoon. "Today I was pulling into a parking space that some guys were standing in the middle of, and I almost hit them," Lovato tweeted.

"When one of the guys turned around, it was a Beatle!" she continued. "Yes, you heard me! Sir Paul McCartney! He was so sweet! Can't believe I met him today. Wow!"

Though Lovato was able to laugh at herself, she added: "I can't believe I almost ran over a Beatle."

The former Disney Channel star is currently working on the follow-up to her  2011 album Unbroken. "The lyrics are flowing," she tweeted.