03/08/2014 09:36 am ET Updated Mar 12, 2014

Pregnant Jenna Fischer Poses In A Bikini Top On Twitter

Days after her on-screen husband John Krasinski welcomed his first child, Jenna Fischer announced she is expecting her second. And on her birthday, March 7, Fischer shared a photo of her growing belly on Twitter from the beach-side location where she celebrated the big 4-0.

Fischer thanked her fans for their warm wishes as she took in the sun's rays in a blue bikini top and white pants.

"I'm almost in my third trimester, so we're in the homestretch already," Fischer told People last week, adding: "I'm taking a good amount of time off right now to be a mom and grow my family, so I'm really just looking forward to getting to do that."

Congrats on your birthday and your baby, Jenna!