Emily Deschanel, who has been playing forensic anthropologist Dr. Temperance Brennan on Bones for the past ten years, showed off her baby bump Monday at the 200th episode celebration of the Fox series.

The 38-year-old actress announced that she is expecting her second child last week and this was the first public appearance since the announcement. For the event, Deschanel looked elegant in a charcoal Lanvin dress covered in sequins and topped with a black Max Mara tuxedo jacket.

Deschanel and her husband, David Hornsby, actor and writer of It’s Always Sunny in Philadelphia, married in September 2010 and welcomed their first child, son Henry Lamar, in September 2011.

Deschanel, who is the sister of Zooey Deschanel, told Us Weekly that she expects Temperance will also be pregnant on the show.

“Yes, I think it will be [written into the show],” Deschanel said. “I’m not like a tiny pregnant person. I’m not going to be able to hide it behind something small; it’ll be easier to not hide it.”

Gracing us on the red carpet tonight at the #Bones200 party is the one and only @emilydeschanel! #bones pic.twitter.com/BSMmiYBHO6

— BONES (@BONESonFOX) December 9, 2014

Tonight, we enjoy a very special night with our favorite stars of #bones! Tune in NOW to celebrate #Bones200! pic.twitter.com/VYubnwoRyC

— BONES (@BONESonFOX) December 12, 2014

The sex of the on-screen baby is apparently a mystery, just like the majority of Bones episodes.

“I know that it’ll happen in the next couple of episodes we’re filming, but that’s it,” she admitted to Us. “I don’t know if it’ll be a boy or a girl.”

Get an exclusive look at 'Bones" 200th episode, set in 1950s Hollywood: http://t.co/ULP1T1fiZE pic.twitter.com/xLjQZnOpfL

— Entertainment Weekly (@EW) December 11, 2014

#Bones 200th Episode: @David_Boreanaz & @emilydeschanel spill everything you need to know! http://t.co/2oDUzVT4BL pic.twitter.com/nhWq2tGBMg

— EntertainmentTonight (@etnow) December 11, 2014

We're retiring our lab coats tonight as we travel back to the '50s. Join us at 8/7c to celebrate #Bones200! #bones pic.twitter.com/e1X5dey0bI

— BONES (@BONESonFOX) December 11, 2014

Deschanel and David Boreanz, who plays FBI agent Seeley Booth, have been sizzling on the small screen since 2005. The now on-screen married couple work together to solve various cases with their cohorts at the Jefferson Institute.

The 200th episode of Bones aired Thursday 8 p.m. ET on Fox. But don’t worry if you missed it. You can still catch it on the Fox website on Friday.