Taking to Instagram earlier today (1 April), Luisa shared a photo of a positive pregnancy test and posted two baby emojis alongside it.
Many fans took Luisa's post as picture proof she is now expecting and were quick to congratulate the 28-year-old on her exciting news.
One user said: "Dixie's going to be the best sister she must be excited! Congratulations!" While another commented: "Congratulation @luisazissman lovely news X."
However, given that today is April Fools' Day, others doubted whether Luisa was being genuine or not and some had even hit out at the star for playing an 'insensitive' prank.
Luisa, meanwhile, confirmed her baby news is true by sharing a screenshot of a tweet that congratulated her on her pregnancy and stated it was not an April Fools joke. Sources also told The Daily Star the photo was genuine.
Alongside her post, Luisa then said: "So for all you hating on my post.... Who wants to apologise first?!"
She also tweeted: "Is it April fools day today? I didn't realise."
Is it April fools day today? I didn't realise— Luisa Zissman (@TheLuluLife) April 1, 2016
Luisa's baby joy comes after she wed husband and businessman Andrew Collins in July last year - they had revealed their engagement in October 2014.
Since getting together, Luisa has kept notoriously private about her relationship.
She is already mum to daughter Dixie, five, who she shares with her ex-husband Oliver Zissman.
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