"[She's] told people she's going to name the baby Ace!" a source told the magazine.
If you're wondering where you've heard Jessica's name of choice before, a few options might be: Jim Carrey's 1994 comedy "Ace Ventura," or maybe during a Kiss concert, as it is the former lead guitarist's stage name.
Ace will be Simpson's second baby with her fiance, Eric Johnson. The couple welcomed Maxwell Drew, their first child, in May 2012.
Simpson confirmed her second pregnancy in a tweet on Christmas Day.
Merry Christmas from my family to yours! twitter.com/JessicaSimpson…— Jessica Simpson (@JessicaSimpson) December 25, 2012