Britney Spears is 'so excited' about wedding to Sam Asghari, source says

Faye Sadou via www.imago-images./www.imago-images.de/www.globallookpress.com

The couple is ready to tie the knot!

Britney Spears is feeling very "emotional" as she prepares to wed Sam Asghari Thursday.

A source close to the couple tells that Spears has been envisioning saying "I do" to the fitness instructor and actor, 28, for nearly nine months.

"Britney started planning and dreaming about her wedding shortly after she got engaged in November," says the insider. "She has enjoyed the planning, but also felt stressed about it."

"It's a huge deal to her that she is finally able to get married. She wants it to be perfect," continues the PEOPLE’s source. "She is so excited that she feels overwhelmed. She is very emotional."