'Preggers' Megan Fox isn't revealing baby daddy's identity

Megan Fox recently confirmed that she has a baby on board, but isn't revealing her baby daddy.

After the 29-year-old actress debuted her baby bump at a Hollywood event, she took to her Instagram and posted snaps with her three co-stars Shia LaBeouf, Will Arnett and Jake Johnson, reports TMZ.com.

Interestingly, along with the picture Fox wrote, "#notthefather."

As of now, it is being speculated that Brian Austin Green is the father of the baby.

The actress walked the aisle with Green in 2010, but she filed divorce stating irrevocable differences in 2015.