The blonde model, who won the All Stars edition of ANTM, looked blooming at a celebration for the show's landmark 20th cycle in Los Angeles on Wednesday evening (7 August).
Lisa showed her bump to its full effect with a long-sleeved black crop top with cut-out detailing at the shoulder, teamed with a flowing maxi skirt.
She finished her quirky look with a giant bow in her hair.
Lisa announced back in May that she was five months pregnant with a baby boy, joking she was joining a long queue of currently pregnant stars.
"It seems everyone is pregnant these days. The stork is drunk! Someone needs to tell him to go to bed," she told E! News.
She later added on her Instagram page: "I'm very excited to be the mum I didn't get to have growing up...I've always dreamt of that day. I will be the best mother- trust that."
And just because Lisa is pregnant doesn't mean she's slowing down her modelling. She tweeted a gorgeous picture of herself during a photoshoot this week, adding the caption: "Who says you can't model pregnant?"
She has also revealed there's just two months to go until she welcomes her little bundle of joy, tweeting: "8 more weeks! Woohoo!"
Lisa, who appeared on cycle five of Top Model before returning for the All Stars cycle, tied the knot with husband Adam Friedman in Los Angeles in October 2012.
More pregnant stars in our gallery below!
Copyright: Vimeo / Weiss Eubanks