The former Spice Girl posted a photograph of herself and her family in the early hours of Boxing Day. The family snap featured the X Factor judge, her American film producer husband and their three daughters. She wrote alongside the snap: "Have a merry Christmas! #familytime #funday".
The photograph shows the foursome gathered happily together on a sofa, with Mel B cuddling the couple's little one.
Stephen, 39, shared a glimpse into last-minute preparations on Christmas Eve by sharing a snap of himself and Phoenix doing some shopping.
As Stephen smiled for the camera and Phoenix pulled a funny face, he wrote: "Me and @phoenixisphoenix getting last min Christmas shopping done!! #tisstheseason."
The united front follows rumours that Mel B had left her husband after The X Factor judge was rushed to hospital with stomach pains and missed The X Factor's live final.
The 39-year-old returned to the show on Sunday evening, but sparked concern amongst fans over her appearance, with many commenting that she didn't look well.
When host Dermot O' Leary asked if she was better, Mel said: "Yes – ish".
Mel was not wearing her wedding ring when she returned to the show. According to reports, she later packed up her belongings and left the home the couple had been sharing in London after their arguing became too much to bear.