"He warned me he might," she revealed.
"He managed to take the screen and IV drips down with him," she said.
"We were able to meet up in recovery with matching hospital bands!"
On May 23, Marni posted to Instagram, where she confirmed she had given birth to her baby boy.
"Charlie Joseph Robertshaw. Prepare to be loved." she wrote on May 23.
Marni, who married David last year, is also mum to four-year-old Archie - who she shares with Dan.