The 34-year-old 'Piranha 3D' star had earlier sparked speculation that she had tie the knot with McIntosh by posting a picture and referring to him as her 'husband' on Instagram.
"Look how happy my husband looks," Brook had written on Friday.
The actress took to social media again to clarify. She shared a picture of herself in a short white dress and David in a suit at the wedding ceremony of a friend, with the caption: "Wedding Day!! Not Ours HA! Lol (sic)"
Brook and the 'Gladiators' star have had an on-off relationship since they met on New Year's Eve.