How I Met Your Mother's Cobie Smulders broke news at the Sundance Film Festival that she and Taran Killam have welcomed their second child together -- get the details! Credit: Jason Merritt/Getty Images

Under the radar! Cobie Smulders and Taran Killam have welcomed their second child together. The How I Met Your Mother alum showed off her post-baby body and subtly mentioned the little one's arrival while promoting her film Unexpected at the 2015 Sundance Film Festival on Sunday, Jan. 25.

"I'm in Sundance and I have a 3-week-old baby, so I can certainly relate," Smolders told Bustle of the film's motherhood theme. "It's my world at the moment, and it's just so prevalent in the world today. I'm very lucky where I have a great career and a huge support system and not every woman has that. It's an interesting film because it shows both of those sides."

Us Weekly confirmed back in October that Smulders and the Saturday Night Live star, both 32, were expecting a second baby. "They talked about growing their family once she was done with [HIMYM] and moved to New York," an insider told Us at the time.

The couple wed in September 2012 in Solvang, Calif., and are already parents to daughter Shaelyn Cado, 5. In October, Killam gushed to Us about his "favorite person" Smulders and how the couple weren't finding out the sex of the baby.

"We're going to [make it a] surprise. Everything's healthy and coming along well," he said at the Labyrinth Theater Company Celebrity Charades event in NYC on Oct. 27. "I'm hoping my schedule lends itself to a newborn just in that I'm up all night. Hopefully that works out!"