Jenna Fischer: Prenatal Workout!

Jenna Fischer shows off her growing baby bump while leaving a private gym on Friday (June 24) in Los Angeles.

The 37-year-old Office star is expecting her first child with husband Lee Kirk.

Jenna recently teamed up with the Joplin Tornado Relief eBay Charity Auction to help raise funds for those affected by the devastating tornado in Missouri.

“Jenna has been just amazing. She’s originally from Missouri and she donated a set visit to The Office,” auction organizer Tyler Childs told Fox411.com. “We were hoping that maybe she could sign a DVD set of The Office, but she really pressed for the set visit – something they rarely do – and she made it happen.”

All proceeds will benefit the United Way of Southwest Missouri and Southeast Kansas and the Joplin Tornado Relief Efforts.