Jenna Fischer just celebrated the big 4-0, and if this is what being “over the hill” looks like, you can count us in! The Office star is currently pregnant with her second baby due this summer — and on March 7, she took to Twitter to show off her growing baby bump in a hot bikini top.

The actress’ pregnant belly can clearly be seen popping out underneath her blue top. Jenna’s already pretty far along. In fact, it’s a wonder she managed to keep her pregnancy a secret for so long.

Thanks for all the sweet birthday messages.  I think I found a good place to celebrate!” Jenna tweeted alongside the sunny, beachside pic. She’s striking a confident pose, and we have to say, her pregnancy figure looks pretty fantastic. Yoga at the beach, perhaps? Whatever it is, it’s working.

Jenna and her husband, screenwriter Lee Kirk, married in summer of 2010. The next fall, they welcomed their first child, a little boy named Weston. There’s no word yet on the sex of baby number two.

As for her most famous on-screen romance, Jenna’s Office hubby, John Krasinski (Jim) welcomed his first child as recently as February 16. John and wife Emily Blunt named their daughter Hazel. Anyone else hoping for some cute Kirk-Krasinski baby playdates?

Source: Jenna Fischer on Twitter