Uchitel posted a picture of current husband Matt Hahn patting her 'baby bump' on her Twitter account on Wednesday (December 28).
She also wrote: "Expecting big things for 2012... Five down, Four months to go... MattyHahn checking out my baby bump at 5 months."
Hahn and Uchitel wed earlier this year in Clark County, Nevada after living together for several months.
Uchitel gained notoriety when her alleged affair with married golf champion Woods was reported in the media in late 2009.
She has since starred in Celebrity Rehab with Dr Drew and is currently developing a reality series about her work as a private investigator.
> Elin Nordegren boyfriend dated Tiger Woods mistress Rachel Uchitel?
> Rachel Uchitel "so happy" over Bin Laden death