The singer, who topped the UK album charts with her debut release 'The Power Of Love' on Sunday night, proudly showed off her baby bump in a long, blue dress on the red carpet, as she posed with her smiling husband, Craig Pearson.
Sam announced back in March that she was expecting her third child, just months after she was crowned the winner of 'The X Factor'.
She previously said that she was nervous to tell her management that she was expecting, but revealed they had been supportive of her happy news.
Sam is already a mum to eight-year-old Brooke and five-year-old Tommy, who she told us were "over the moon" when she told them she was having another baby.
Her pregnancy meant that she had to delay her first headline UK tour, which will now begin in January 2015.
Sam's win was criticised by former 'Apprentice' contestant Katie Hopkins - who described her as a "fat mum in a jumpsuit" - prompting the star to hit back, telling OK! magazine: "She'll be a very guilty woman when she goes to her deathbed."