'Baby is the size of a mango': The Bachelor's pregnant Catherine Giudici Lowe reveals 19-week bump in sweet gym selfie

She is expecting her second child with The Bachelor's Sean Lowe.

And Catherine Giudici-Lowe looked every inch the happy mother-to-be as she posted an adorable Instagram story revealing her baby bump on Friday.

'Baby is the size of a mango,' the 31-year-old captioned the snap of herself holding a medicine ball up to her stomach for comparison. 

Expecting: Catherine Giudici-Lowe looked every inch the happy mother-to-be as she posted an adorable Instagram story revealing her baby bump on Friday

Expecting: Catherine Giudici-Lowe looked every inch the happy mother-to-be as she posted an adorable Instagram story revealing her baby bump on Friday

'19 weeks,' she added to the gym selfie.

The beauty showcased her flawless expectant physique in a short sleeved grey top and black leggings.

Her trademark brunette tresses were swept up in a messy bun allowing her youthful face to shine. 

Throwing caution to the wind, the petite stunner went virtually makeup free with jsut a dab of berry lip.

Funny girl: Catherine also shared a Boomerang video of herself rubbing the medicine ball as if it were her baby

Funny girl: Catherine also shared a Boomerang video of herself rubbing the medicine ball as if it were her baby

Family fun: Catherine shares 17-month Samuel Thomas with her husband Sean

Family fun: Catherine shares 17-month Samuel Thomas with her husband Sean

Catherine also shared a Boomerang video of herself rubbing the medicine ball as if it were her baby.

'Pregnancy makes you do bizarre things. Like pretend a medicine ball is your baby and then document and publish it,' she quipped.

Catherine shares 17-month Samuel Thomas with her husband Sean.

Betrothed: She met Sean Lowe on Season 17 of The Bachelor, got engaged on the March 11, 2013 finale, and married in a wedding that aired live on Jan. 26, 2014.

Betrothed: She met Sean Lowe on Season 17 of The Bachelor, got engaged on the March 11, 2013 finale, and married in a wedding that aired live on Jan. 26, 2014.

The two met on Season 17 of The Bachelor, got engaged on the March 11, 2013 finale, and married in a wedding that aired live on Jan. 26, 2014.

The new addition was not a surprise as the happy couple had spoken about wanting a large family. 

In September, Sean told People that another baby is 'not off in the distance because Catherine wants a big family — she’s convinced she wants several more kids.'

'I’m 33 going on 34, so we better get crackin’ sooner or later!' he joked, adding: 'I would say that hopefully in 2018 we have another one.'

Ready set: In September, Sean told People that another baby is 'not off in the distance because Catherine wants a big family ¿ she¿s convinced she wants several more kids'

Ready set: In September, Sean told People that another baby is 'not off in the distance because Catherine wants a big family — she’s convinced she wants several more kids'

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The Bachelor's Catherine Giudici-Lowe reveals 19-week bump

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