The couple have been together for three years but tied the knot in Italy on Saturday.
Heidi's pal, TV presenter Kate Thornton, shared photos of the sunkissed ceremony as the couple's friends and family came together to help the pair celebrate the big day.
In a touching message to her 140k Twitter followers ahead of the ceremony, the Livverpool singer revealed her excitement: “I'm up & today's the day!
“Marrying the kindest & most gorgeous man I have ever known, my @alexpartakis It's like Christmas but better!”
Heidi has been with property developer Alex for two years after being "set up" by her personal trainer in early 2014.
They announced their engagement on Twitter last year after Alex popped the question to the former Strictly Come Dancing star.
The 33-year-old has been excitedly counting down the days to her wedding with fans.
On Monday she posted: “The lovebirds have landed in Florence. T-minus 5 days X”
And keeping the momentum going, Heidi took to Twitter on Thursday to share a photo of the couple relaxing by a swimming pool ahead of the big day.
'Chilling by the pool with my fiancé. T-minus 2days until we are Husband & Wife! X', she wrote.
Heidi was previously engaged to presenter Dave Berry before they split after eight years together.
I'm up & today's the day! Marrying the kindest & most gorgeous man I have ever known, my @alexpartakis It's like Christmas but better!❤X— heidirange (@Heidi_range) September 3, 2016