The 37-year-old, who plays Pam Halpert in the NBC mockumentary, revealed that she is expecting with her husband Lee Kirk after news outlets picked up on her baby bump this week.
The Hall Pass actress is described by Pop2It as having "debuted" her fuller figure at the Red O Restaurant in LA on Wednesday.
Her spokesperson confirmed to Celebuzz: "Yes. She and her husband Lee Kirk are expecting their first child."
Fischer and Kirk married last July in a ceremony officiated by Survivor host Jeff Probst.
The couple began dating in 2008 and became engaged last summer.